Add frame_times metric to experimental/

This is a port of the TBMv2 frame_time metric [1] to TBMv3.

Some features required by this metric to work on all platforms are still
missing (most notably the SurfaceFlinger events on Android), so adding
this to experimental folder for the time being.

[1] https://source.chromium.org/chromium/chromium/src/+/master:third_party/catapult/tracing/tracing/metrics/rendering/frame_time.html

Change-Id: I9562d93256617357bc4dc7413ca7685a4f496ed3
diff --git a/BUILD b/BUILD
index 6b1204d..4ad0b3a 100644
--- a/BUILD
+++ b/BUILD
@@ -942,6 +942,7 @@
         "src/trace_processor/metrics/chrome/scroll_jank_cause_get_bitmap.sql",
         "src/trace_processor/metrics/chrome/scroll_jank_cause_queuing_delay.sql",
         "src/trace_processor/metrics/chrome/test_chrome_metric.sql",
+        "src/trace_processor/metrics/experimental/frame_times.sql",
         "src/trace_processor/metrics/trace_metadata.sql",
         "src/trace_processor/metrics/webview/webview_power_usage.sql",
     ],
@@ -2328,6 +2329,7 @@
     name = "protos_perfetto_metrics_chrome_protos",
     srcs = [
         "protos/perfetto/metrics/chrome/all_chrome_metrics.proto",
+        "protos/perfetto/metrics/chrome/frame_times.proto",
         "protos/perfetto/metrics/chrome/test_chrome_metric.proto",
     ],
     visibility = [