Add a message for LatencyInfo.Flow

Change-Id: I62ebd3bcb137483893872af10092d671d7ad0e3f
diff --git a/Android.bp b/Android.bp
index d39fb8e..c83a8cb 100644
--- a/Android.bp
+++ b/Android.bp
@@ -4972,6 +4972,7 @@
     "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto",
     "protos/perfetto/trace/track_event/chrome_histogram_sample.proto",
     "protos/perfetto/trace/track_event/chrome_keyed_service.proto",
+    "protos/perfetto/trace/track_event/chrome_latency_info.proto",
     "protos/perfetto/trace/track_event/chrome_legacy_ipc.proto",
     "protos/perfetto/trace/track_event/chrome_process_descriptor.proto",
     "protos/perfetto/trace/track_event/chrome_thread_descriptor.proto",
@@ -4994,6 +4995,7 @@
     "external/perfetto/protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.gen.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_histogram_sample.gen.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_keyed_service.gen.cc",
+    "external/perfetto/protos/perfetto/trace/track_event/chrome_latency_info.gen.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_legacy_ipc.gen.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_process_descriptor.gen.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_thread_descriptor.gen.cc",
@@ -5016,6 +5018,7 @@
     "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto",
     "protos/perfetto/trace/track_event/chrome_histogram_sample.proto",
     "protos/perfetto/trace/track_event/chrome_keyed_service.proto",
+    "protos/perfetto/trace/track_event/chrome_latency_info.proto",
     "protos/perfetto/trace/track_event/chrome_legacy_ipc.proto",
     "protos/perfetto/trace/track_event/chrome_process_descriptor.proto",
     "protos/perfetto/trace/track_event/chrome_thread_descriptor.proto",
@@ -5038,6 +5041,7 @@
     "external/perfetto/protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.gen.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_histogram_sample.gen.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_keyed_service.gen.h",
+    "external/perfetto/protos/perfetto/trace/track_event/chrome_latency_info.gen.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_legacy_ipc.gen.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_process_descriptor.gen.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_thread_descriptor.gen.h",
@@ -5064,6 +5068,7 @@
     "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto",
     "protos/perfetto/trace/track_event/chrome_histogram_sample.proto",
     "protos/perfetto/trace/track_event/chrome_keyed_service.proto",
+    "protos/perfetto/trace/track_event/chrome_latency_info.proto",
     "protos/perfetto/trace/track_event/chrome_legacy_ipc.proto",
     "protos/perfetto/trace/track_event/chrome_process_descriptor.proto",
     "protos/perfetto/trace/track_event/chrome_thread_descriptor.proto",
@@ -5085,6 +5090,7 @@
     "external/perfetto/protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.pb.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_histogram_sample.pb.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_keyed_service.pb.cc",
+    "external/perfetto/protos/perfetto/trace/track_event/chrome_latency_info.pb.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_legacy_ipc.pb.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_process_descriptor.pb.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_thread_descriptor.pb.cc",
@@ -5107,6 +5113,7 @@
     "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto",
     "protos/perfetto/trace/track_event/chrome_histogram_sample.proto",
     "protos/perfetto/trace/track_event/chrome_keyed_service.proto",
+    "protos/perfetto/trace/track_event/chrome_latency_info.proto",
     "protos/perfetto/trace/track_event/chrome_legacy_ipc.proto",
     "protos/perfetto/trace/track_event/chrome_process_descriptor.proto",
     "protos/perfetto/trace/track_event/chrome_thread_descriptor.proto",
@@ -5128,6 +5135,7 @@
     "external/perfetto/protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.pb.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_histogram_sample.pb.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_keyed_service.pb.h",
+    "external/perfetto/protos/perfetto/trace/track_event/chrome_latency_info.pb.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_legacy_ipc.pb.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_process_descriptor.pb.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_thread_descriptor.pb.h",
@@ -5154,6 +5162,7 @@
     "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto",
     "protos/perfetto/trace/track_event/chrome_histogram_sample.proto",
     "protos/perfetto/trace/track_event/chrome_keyed_service.proto",
+    "protos/perfetto/trace/track_event/chrome_latency_info.proto",
     "protos/perfetto/trace/track_event/chrome_legacy_ipc.proto",
     "protos/perfetto/trace/track_event/chrome_process_descriptor.proto",
     "protos/perfetto/trace/track_event/chrome_thread_descriptor.proto",
@@ -5176,6 +5185,7 @@
     "external/perfetto/protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.pbzero.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_histogram_sample.pbzero.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_keyed_service.pbzero.cc",
+    "external/perfetto/protos/perfetto/trace/track_event/chrome_latency_info.pbzero.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_legacy_ipc.pbzero.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_process_descriptor.pbzero.cc",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_thread_descriptor.pbzero.cc",
@@ -5198,6 +5208,7 @@
     "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto",
     "protos/perfetto/trace/track_event/chrome_histogram_sample.proto",
     "protos/perfetto/trace/track_event/chrome_keyed_service.proto",
+    "protos/perfetto/trace/track_event/chrome_latency_info.proto",
     "protos/perfetto/trace/track_event/chrome_legacy_ipc.proto",
     "protos/perfetto/trace/track_event/chrome_process_descriptor.proto",
     "protos/perfetto/trace/track_event/chrome_thread_descriptor.proto",
@@ -5220,6 +5231,7 @@
     "external/perfetto/protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.pbzero.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_histogram_sample.pbzero.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_keyed_service.pbzero.h",
+    "external/perfetto/protos/perfetto/trace/track_event/chrome_latency_info.pbzero.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_legacy_ipc.pbzero.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_process_descriptor.pbzero.h",
     "external/perfetto/protos/perfetto/trace/track_event/chrome_thread_descriptor.pbzero.h",
diff --git a/BUILD b/BUILD
index 9ac10f3..e7a59ac 100644
--- a/BUILD
+++ b/BUILD
@@ -2400,6 +2400,7 @@
         "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto",
         "protos/perfetto/trace/track_event/chrome_histogram_sample.proto",
         "protos/perfetto/trace/track_event/chrome_keyed_service.proto",
+        "protos/perfetto/trace/track_event/chrome_latency_info.proto",
         "protos/perfetto/trace/track_event/chrome_legacy_ipc.proto",
         "protos/perfetto/trace/track_event/chrome_process_descriptor.proto",
         "protos/perfetto/trace/track_event/chrome_thread_descriptor.proto",
diff --git a/protos/perfetto/trace/perfetto_trace.proto b/protos/perfetto/trace/perfetto_trace.proto
index e601cd8..8635dc0 100644
--- a/protos/perfetto/trace/perfetto_trace.proto
+++ b/protos/perfetto/trace/perfetto_trace.proto
@@ -4072,6 +4072,14 @@
 
 // End of protos/perfetto/trace/track_event/chrome_legacy_ipc.proto
 
+// Begin of protos/perfetto/trace/track_event/chrome_latency_info.proto
+
+message ChromeLatencyInfo {
+  optional int64 trace_id = 1;
+}
+
+// End of protos/perfetto/trace/track_event/chrome_latency_info.proto
+
 // Begin of protos/perfetto/trace/track_event/chrome_process_descriptor.proto
 
 // Describes the attributes for a Chrome process. Must be paired with a
@@ -4473,7 +4481,7 @@
 // their default track association) can be emitted as part of a
 // TrackEventDefaults message.
 //
-// Next reserved id: 12 (up to 15). Next id: 29.
+// Next reserved id: 12 (up to 15). Next id: 30.
 message TrackEvent {
   // Names of categories of the event. In the client library, categories are a
   // way to turn groups of individual events on or off.
@@ -4573,6 +4581,7 @@
   optional ChromeKeyedService chrome_keyed_service = 26;
   optional ChromeLegacyIpc chrome_legacy_ipc = 27;
   optional ChromeHistogramSample chrome_histogram_sample = 28;
+  optional ChromeLatencyInfo chrome_latency_info = 29;
   // New argument types go here :)
 
   // ---------------------------------------------------------------------------
diff --git a/protos/perfetto/trace/track_event/BUILD.gn b/protos/perfetto/trace/track_event/BUILD.gn
index 2cb38d0..b4d3c86 100644
--- a/protos/perfetto/trace/track_event/BUILD.gn
+++ b/protos/perfetto/trace/track_event/BUILD.gn
@@ -19,6 +19,7 @@
     "chrome_compositor_scheduler_state.proto",
     "chrome_histogram_sample.proto",
     "chrome_keyed_service.proto",
+    "chrome_latency_info.proto",
     "chrome_legacy_ipc.proto",
     "chrome_process_descriptor.proto",
     "chrome_thread_descriptor.proto",
diff --git a/protos/perfetto/trace/track_event/chrome_latency_info.proto b/protos/perfetto/trace/track_event/chrome_latency_info.proto
new file mode 100644
index 0000000..092323b
--- /dev/null
+++ b/protos/perfetto/trace/track_event/chrome_latency_info.proto
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+syntax = "proto2";
+
+package perfetto.protos;
+
+message ChromeLatencyInfo {
+  optional int64 trace_id = 1;
+}
diff --git a/protos/perfetto/trace/track_event/track_event.proto b/protos/perfetto/trace/track_event/track_event.proto
index c566648..7d6cb5c 100644
--- a/protos/perfetto/trace/track_event/track_event.proto
+++ b/protos/perfetto/trace/track_event/track_event.proto
@@ -22,6 +22,7 @@
 import "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto";
 import "protos/perfetto/trace/track_event/chrome_histogram_sample.proto";
 import "protos/perfetto/trace/track_event/chrome_keyed_service.proto";
+import "protos/perfetto/trace/track_event/chrome_latency_info.proto";
 import "protos/perfetto/trace/track_event/chrome_legacy_ipc.proto";
 import "protos/perfetto/trace/track_event/chrome_user_event.proto";
 
@@ -86,7 +87,7 @@
 // their default track association) can be emitted as part of a
 // TrackEventDefaults message.
 //
-// Next reserved id: 12 (up to 15). Next id: 29.
+// Next reserved id: 12 (up to 15). Next id: 30.
 message TrackEvent {
   // Names of categories of the event. In the client library, categories are a
   // way to turn groups of individual events on or off.
@@ -186,6 +187,7 @@
   optional ChromeKeyedService chrome_keyed_service = 26;
   optional ChromeLegacyIpc chrome_legacy_ipc = 27;
   optional ChromeHistogramSample chrome_histogram_sample = 28;
+  optional ChromeLatencyInfo chrome_latency_info = 29;
   // New argument types go here :)
 
   // ---------------------------------------------------------------------------
diff --git a/src/trace_processor/importers/proto/track_event.descriptor.h b/src/trace_processor/importers/proto/track_event.descriptor.h
index 8dd6d2f..18b55d0 100644
--- a/src/trace_processor/importers/proto/track_event.descriptor.h
+++ b/src/trace_processor/importers/proto/track_event.descriptor.h
@@ -27,14 +27,14 @@
 // SHA1(tools/gen_binary_descriptors)
 // d6628b15181dba5287e35b56b966b39ea93d42b1
 // SHA1(protos/perfetto/trace/track_event/track_event.proto)
-// 1cd2627d7a57ddcf4e61b967cd255011bf3a09d5
+// 95388875c7d195fda1983d29fa5fb8933c45ba13
 
 // This is the proto TrackEvent encoded as a ProtoFileDescriptor to allow
 // for reflection without libprotobuf full/non-lite protos.
 
 namespace perfetto {
 
-constexpr std::array<uint8_t, 16141> kTrackEventDescriptor{
+constexpr std::array<uint8_t, 16414> kTrackEventDescriptor{
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      0x63, 0x65, 0x2f, 0x74, 0x72, 0x61, 0x63, 0x6b, 0x5f, 0x65, 0x76, 0x65,
@@ -1021,366 +1021,388 @@
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+     0x49, 0x45, 0x44, 0x10, 0x00, 0x12, 0x0b, 0x0a, 0x07, 0x46, 0x4c, 0x4f,
+     0x57, 0x5f, 0x49, 0x4e, 0x10, 0x01, 0x12, 0x0c, 0x0a, 0x08, 0x46, 0x4c,
+     0x4f, 0x57, 0x5f, 0x4f, 0x55, 0x54, 0x10, 0x02, 0x12, 0x0e, 0x0a, 0x0a,
+     0x46, 0x4c, 0x4f, 0x57, 0x5f, 0x49, 0x4e, 0x4f, 0x55, 0x54, 0x10, 0x03,
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+     0x76, 0x65, 0x6e, 0x74, 0x53, 0x63, 0x6f, 0x70, 0x65, 0x12, 0x15, 0x0a,
+     0x11, 0x53, 0x43, 0x4f, 0x50, 0x45, 0x5f, 0x55, 0x4e, 0x53, 0x50, 0x45,
+     0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00, 0x12, 0x10, 0x0a, 0x0c,
+     0x53, 0x43, 0x4f, 0x50, 0x45, 0x5f, 0x47, 0x4c, 0x4f, 0x42, 0x41, 0x4c,
+     0x10, 0x01, 0x12, 0x11, 0x0a, 0x0d, 0x53, 0x43, 0x4f, 0x50, 0x45, 0x5f,
+     0x50, 0x52, 0x4f, 0x43, 0x45, 0x53, 0x53, 0x10, 0x02, 0x12, 0x10, 0x0a,
+     0x0c, 0x53, 0x43, 0x4f, 0x50, 0x45, 0x5f, 0x54, 0x48, 0x52, 0x45, 0x41,
+     0x44, 0x10, 0x03, 0x42, 0x04, 0x0a, 0x02, 0x69, 0x64, 0x4a, 0x04, 0x08,
+     0x05, 0x10, 0x06, 0x22, 0x58, 0x0a, 0x04, 0x54, 0x79, 0x70, 0x65, 0x12,
+     0x14, 0x0a, 0x10, 0x54, 0x59, 0x50, 0x45, 0x5f, 0x55, 0x4e, 0x53, 0x50,
+     0x45, 0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00, 0x12, 0x14, 0x0a,
+     0x10, 0x54, 0x59, 0x50, 0x45, 0x5f, 0x53, 0x4c, 0x49, 0x43, 0x45, 0x5f,
+     0x42, 0x45, 0x47, 0x49, 0x4e, 0x10, 0x01, 0x12, 0x12, 0x0a, 0x0e, 0x54,
+     0x59, 0x50, 0x45, 0x5f, 0x53, 0x4c, 0x49, 0x43, 0x45, 0x5f, 0x45, 0x4e,
+     0x44, 0x10, 0x02, 0x12, 0x10, 0x0a, 0x0c, 0x54, 0x59, 0x50, 0x45, 0x5f,
+     0x49, 0x4e, 0x53, 0x54, 0x41, 0x4e, 0x54, 0x10, 0x03, 0x42, 0x0c, 0x0a,
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+     0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x22, 0x33, 0x0a, 0x12, 0x54,
+     0x72, 0x61, 0x63, 0x6b, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x44, 0x65, 0x66,
+     0x61, 0x75, 0x6c, 0x74, 0x73, 0x12, 0x1d, 0x0a, 0x0a, 0x74, 0x72, 0x61,
+     0x63, 0x6b, 0x5f, 0x75, 0x75, 0x69, 0x64, 0x18, 0x0b, 0x20, 0x01, 0x28,
+     0x04, 0x52, 0x09, 0x74, 0x72, 0x61, 0x63, 0x6b, 0x55, 0x75, 0x69, 0x64,
+     0x22, 0x35, 0x0a, 0x0d, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x43, 0x61, 0x74,
+     0x65, 0x67, 0x6f, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x69, 0x69, 0x64,
+     0x18, 0x01, 0x20, 0x01, 0x28, 0x04, 0x52, 0x03, 0x69, 0x69, 0x64, 0x12,
+     0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28,
+     0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x22, 0x31, 0x0a, 0x09, 0x45,
+     0x76, 0x65, 0x6e, 0x74, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x10, 0x0a, 0x03,
      0x69, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x04, 0x52, 0x03, 0x69,
      0x69, 0x64, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x02,
-     0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x22, 0x31,
-     0x0a, 0x09, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x4e, 0x61, 0x6d, 0x65, 0x12,
-     0x10, 0x0a, 0x03, 0x69, 0x69, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x04,
-     0x52, 0x03, 0x69, 0x69, 0x64, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d,
-     0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d,
-     0x65}};
+     0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65}};
 
 }  // namespace perfetto
 
diff --git a/src/trace_processor/importers/proto/track_event_parser.cc b/src/trace_processor/importers/proto/track_event_parser.cc
index ebcfccf..e8faa89 100644
--- a/src/trace_processor/importers/proto/track_event_parser.cc
+++ b/src/trace_processor/importers/proto/track_event_parser.cc
@@ -30,6 +30,7 @@
 #include "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.pbzero.h"
 #include "protos/perfetto/trace/track_event/chrome_histogram_sample.pbzero.h"
 #include "protos/perfetto/trace/track_event/chrome_keyed_service.pbzero.h"
+#include "protos/perfetto/trace/track_event/chrome_latency_info.pbzero.h"
 #include "protos/perfetto/trace/track_event/chrome_legacy_ipc.pbzero.h"
 #include "protos/perfetto/trace/track_event/chrome_process_descriptor.pbzero.h"
 #include "protos/perfetto/trace/track_event/chrome_thread_descriptor.pbzero.h"
@@ -167,6 +168,8 @@
           context->storage->InternString("histogram_sample.name")),
       chrome_histogram_sample_sample_args_key_id_(
           context->storage->InternString("histogram_sample.sample")),
+      chrome_latency_info_trace_id_key_id_(
+          context->storage->InternString("latency_info.trace_id")),
       chrome_legacy_ipc_class_ids_{
           {context->storage->InternString("UNSPECIFIED"),
            context->storage->InternString("AUTOMATION"),
@@ -649,6 +652,9 @@
     if (event.has_chrome_histogram_sample()) {
       ParseChromeHistogramSample(event.chrome_histogram_sample(), inserter);
     }
+    if (event.has_chrome_latency_info()) {
+      ParseChromeLatencyInfo(event.chrome_latency_info(), inserter);
+    }
 
     if (legacy_passthrough_utid) {
       inserter->AddArg(legacy_event_passthrough_utid_id_,
@@ -1248,6 +1254,18 @@
   }
 }
 
+void TrackEventParser::ParseChromeLatencyInfo(
+    protozero::ConstBytes chrome_latency_info,
+    ArgsTracker::BoundInserter* inserter) {
+  protos::pbzero::ChromeLatencyInfo::Decoder event(chrome_latency_info.data,
+                                                   chrome_latency_info.size);
+
+  if (event.has_trace_id()) {
+    inserter->AddArg(chrome_latency_info_trace_id_key_id_,
+                     Variadic::Integer(event.trace_id()));
+  }
+}
+
 void TrackEventParser::ParseChromeHistogramSample(
     protozero::ConstBytes chrome_histogram_sample,
     ArgsTracker::BoundInserter* inserter) {
diff --git a/src/trace_processor/importers/proto/track_event_parser.h b/src/trace_processor/importers/proto/track_event_parser.h
index 10d8e03..8219f85 100644
--- a/src/trace_processor/importers/proto/track_event_parser.h
+++ b/src/trace_processor/importers/proto/track_event_parser.h
@@ -81,6 +81,8 @@
                         ArgsTracker::BoundInserter* inserter);
   void ParseChromeUserEvent(protozero::ConstBytes chrome_user_event,
                             ArgsTracker::BoundInserter* inserter);
+  void ParseChromeLatencyInfo(protozero::ConstBytes chrome_latency_info,
+                              ArgsTracker::BoundInserter* inserter);
   void ParseChromeLegacyIpc(protozero::ConstBytes chrome_legacy_ipc,
                             ArgsTracker::BoundInserter* inserter);
   void ParseChromeKeyedService(protozero::ConstBytes chrome_keyed_service,
@@ -122,6 +124,7 @@
   const StringId chrome_histogram_sample_name_hash_args_key_id_;
   const StringId chrome_histogram_sample_name_args_key_id_;
   const StringId chrome_histogram_sample_sample_args_key_id_;
+  const StringId chrome_latency_info_trace_id_key_id_;
 
   std::array<StringId, 38> chrome_legacy_ipc_class_ids_;
   std::array<StringId, 9> chrome_process_name_ids_;
diff --git a/test/trace_processor/track_event_typed_args.textproto b/test/trace_processor/track_event_typed_args.textproto
index 3c49c21..c66d595 100644
--- a/test/trace_processor/track_event_typed_args.textproto
+++ b/test/trace_processor/track_event_typed_args.textproto
@@ -51,3 +51,16 @@
     }
   }
 }
+packet {
+  trusted_packet_sequence_id: 1
+  timestamp: 4000
+  track_event {
+    track_uuid: 1
+    categories: "cat"
+    name: "name4"
+    type: 3
+    chrome_latency_info {
+      trace_id: 7
+    }
+  }
+}
diff --git a/test/trace_processor/track_event_typed_args_args.out b/test/trace_processor/track_event_typed_args_args.out
index c66424f..ef363ca 100644
--- a/test/trace_processor/track_event_typed_args_args.out
+++ b/test/trace_processor/track_event_typed_args_args.out
@@ -3,3 +3,4 @@
 2,"legacy_ipc.class","legacy_ipc.class","[NULL]","AUTOMATION"
 2,"legacy_ipc.line","legacy_ipc.line",10,"[NULL]"
 3,"keyed_service.name","keyed_service.name","[NULL]","MediaRouter"
+4,"latency_info.trace_id","latency_info.trace_id",7,"[NULL]"
diff --git a/test/trace_processor/track_event_typed_args_slices.out b/test/trace_processor/track_event_typed_args_slices.out
index 830accb..84026f7 100644
--- a/test/trace_processor/track_event_typed_args_slices.out
+++ b/test/trace_processor/track_event_typed_args_slices.out
@@ -2,3 +2,4 @@
 "[NULL]","[NULL]","t1","[NULL]",1000,0,"cat","name1",1
 "[NULL]","[NULL]","t1","[NULL]",2000,0,"cat","name2",2
 "[NULL]","[NULL]","t1","[NULL]",3000,0,"cat","name3",3
+"[NULL]","[NULL]","t1","[NULL]",4000,0,"cat","name4",4
diff --git a/tools/gen_merged_protos b/tools/gen_merged_protos
index a8f9aa6..013dfb6 100755
--- a/tools/gen_merged_protos
+++ b/tools/gen_merged_protos
@@ -99,6 +99,7 @@
     'protos/perfetto/trace/track_event/chrome_histogram_sample.proto',
     'protos/perfetto/trace/track_event/chrome_keyed_service.proto',
     'protos/perfetto/trace/track_event/chrome_legacy_ipc.proto',
+    'protos/perfetto/trace/track_event/chrome_latency_info.proto',
     'protos/perfetto/trace/track_event/chrome_process_descriptor.proto',
     'protos/perfetto/trace/track_event/chrome_thread_descriptor.proto',
     'protos/perfetto/trace/track_event/chrome_user_event.proto',