Add trace duration and rename the metadata proto

Change-Id: I1632247f638aebdd5c2723d3d2976bb049cb8ff9
diff --git a/Android.bp b/Android.bp
index 3d27af3..2ae049c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -37,7 +37,7 @@
     "src/trace_processor/metrics/android/process_unagg_mem_view.sql",
     "src/trace_processor/metrics/android/span_view_stats.sql",
     "src/trace_processor/metrics/android/upid_span_view.sql",
-    "src/trace_processor/metrics/error_statistics.sql",
+    "src/trace_processor/metrics/trace_metadata.sql",
   ],
   cmd: "$(location tools/gen_merged_sql_metrics.py) --cpp_out=$(out) $(in)",
   out: [
diff --git a/BUILD b/BUILD
index 5e37c39..3a49a03 100644
--- a/BUILD
+++ b/BUILD
@@ -44,7 +44,7 @@
         "src/trace_processor/metrics/android/process_unagg_mem_view.sql",
         "src/trace_processor/metrics/android/span_view_stats.sql",
         "src/trace_processor/metrics/android/upid_span_view.sql",
-        "src/trace_processor/metrics/error_statistics.sql",
+        "src/trace_processor/metrics/trace_metadata.sql",
     ],
     outs = [
         "src/trace_processor/metrics/sql_metrics.h",
diff --git a/protos/perfetto/metrics/metrics.proto b/protos/perfetto/metrics/metrics.proto
index 1f64ac2..d779c18 100644
--- a/protos/perfetto/metrics/metrics.proto
+++ b/protos/perfetto/metrics/metrics.proto
@@ -31,16 +31,17 @@
 import "perfetto/metrics/android/heap_profile.proto";
 import "perfetto/metrics/android/package_list.proto";
 
-// Trace processor statistics (taken from the stats table schema and contents).
+// Trace processor metadata (taken from the stats table schema and contents).
 // TODO: perhaps add the other columns once we have enum support
-message TraceStatistics {
+message TraceMetadata {
   message Entry {
     optional string name = 1;
     optional uint32 idx = 2;
     optional int64 value = 3;
   }
 
-  repeated Entry entry = 1;
+  repeated Entry error_stats_entry = 1;
+  optional int64 trace_duration_ns = 2;
 }
 
 // Root message for all Perfetto-based metrics.
@@ -83,8 +84,8 @@
   // Heap profile stats.
   optional HeapProfile heap_profile = 4;
 
-  // Error statistics (applicable to all traces).
-  optional TraceStatistics error_statistics = 3;
+  // Trace metadata (applicable to all traces).
+  optional TraceMetadata trace_metadata = 3;
 
   // Demo extensions.
   extensions 450 to 499;
diff --git a/src/trace_processor/metrics/BUILD.gn b/src/trace_processor/metrics/BUILD.gn
index b8eb3a7..809032d 100644
--- a/src/trace_processor/metrics/BUILD.gn
+++ b/src/trace_processor/metrics/BUILD.gn
@@ -15,7 +15,7 @@
 import("../../../gn/perfetto.gni")
 
 sql_files = [
-  "error_statistics.sql",
+  "trace_metadata.sql",
   "android/android_batt.sql",
   "android/android_cpu.sql",
   "android/android_cpu_agg.sql",
diff --git a/src/trace_processor/metrics/metrics.descriptor.h b/src/trace_processor/metrics/metrics.descriptor.h
index bfc6c84..07ad0fd 100644
--- a/src/trace_processor/metrics/metrics.descriptor.h
+++ b/src/trace_processor/metrics/metrics.descriptor.h
@@ -12,14 +12,14 @@
 // SHA1(tools/gen_binary_descriptors)
 // 750d7d8f95621b45d4b6430d6f8808087a8702e6
 // SHA1(protos/perfetto/metrics/metrics.proto)
-// 74bbe222e9bc51d07f404ce30fb79ca418b3a847
+// 09955a45e49047eef4ee0fab1e5c95483ca8a91f
 
 // This is the proto Metrics encoded as a ProtoFileDescriptor to allow
 // for reflection without libprotobuf full/non-lite protos.
 
 namespace perfetto {
 
-constexpr std::array<uint8_t, 8405> kMetricsDescriptor{
+constexpr std::array<uint8_t, 8461> kMetricsDescriptor{
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      0x64, 0x72, 0x6f, 0x69, 0x64, 0x2f, 0x62, 0x61, 0x74, 0x74, 0x5f, 0x6d,
@@ -582,7 +582,7 @@
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@@ -627,100 +627,105 @@
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+     0x03, 0x2a, 0x06, 0x08, 0xf4, 0x03, 0x10, 0xe9, 0x07, 0x42, 0x02, 0x48,
+     0x03}};
 
 }  // namespace perfetto
 
diff --git a/src/trace_processor/metrics/error_statistics.sql b/src/trace_processor/metrics/trace_metadata.sql
similarity index 73%
rename from src/trace_processor/metrics/error_statistics.sql
rename to src/trace_processor/metrics/trace_metadata.sql
index 4313692..2bee6b3 100644
--- a/src/trace_processor/metrics/error_statistics.sql
+++ b/src/trace_processor/metrics/trace_metadata.sql
@@ -14,8 +14,8 @@
 -- limitations under the License.
 --
 
-CREATE VIEW stats_view AS
-SELECT TraceStatistics_Entry(
+CREATE VIEW error_stats_view AS
+SELECT TraceMetadata_Entry(
   'name', name,
   'idx', idx,
   'value', value) as entry
@@ -23,9 +23,8 @@
 WHERE severity IN ('data_loss', 'error')
 AND value > 0;
 
-CREATE VIEW error_statistics_output AS
-SELECT TraceStatistics(
-  'entry', (
-    select RepeatedField(entry) from stats_view
-  )
+CREATE VIEW trace_metadata_output AS
+SELECT TraceMetadata(
+  'error_stats_entry', (SELECT RepeatedField(entry) FROM error_stats_view),
+  'trace_duration_ns', (SELECT end_ts - start_ts FROM trace_bounds)
 );
diff --git a/test/metrics/error_statistics.out b/test/metrics/error_statistics.out
deleted file mode 100644
index acd170c..0000000
--- a/test/metrics/error_statistics.out
+++ /dev/null
@@ -1,6 +0,0 @@
-error_statistics {
-  entry {
-    name: "mismatched_sched_switch_tids"
-    value: 5
-  }
-}
diff --git a/test/metrics/index b/test/metrics/index
index 41d447e..0caa246 100644
--- a/test/metrics/index
+++ b/test/metrics/index
@@ -1,6 +1,6 @@
 # Real traces
 ../data/memory_counters.pb android_mem android_mem_counters.out
-../data/memory_counters.pb error_statistics error_statistics.out
+../data/memory_counters.pb trace_metadata trace_metadata.out
 
 # Synthetic traces
 android_mem_by_priority.py android_mem android_mem_by_priority.out
diff --git a/test/metrics/trace_metadata.out b/test/metrics/trace_metadata.out
new file mode 100644
index 0000000..c5ca0d8
--- /dev/null
+++ b/test/metrics/trace_metadata.out
@@ -0,0 +1,7 @@
+trace_metadata {
+  error_stats_entry {
+    name: "mismatched_sched_switch_tids"
+    value: 5
+  }
+  trace_duration_ns: 9519159074
+}