Added GPU performance metrics.

tools/perf/benchmarks/gpu_times.py

Index: tools/perf/benchmarks/gpu_times.py
diff --git a/tools/perf/benchmarks/gpu_times.py b/tools/perf/benchmarks/gpu_times.py
new file mode 100644
index 0000000000000000000000000000000000000000..488b31f869e745ce9c0830a3f85ae7d66682b215
--- /dev/null
+++ b/tools/perf/benchmarks/gpu_times.py
@@ -0,0 +1,35 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+from metrics import gpu_timeline
+import page_sets
+from telemetry import benchmark
+from telemetry.core.platform import tracing_category_filter
+from telemetry.web_perf import timeline_based_measurement
+
+TOPLEVEL_GL_CATEGORY = 'gpu_toplevel'
+TOPLEVEL_CATEGORIES = ['disabled-by-default-gpu.device',
+                       'disabled-by-default-gpu.service']
+
+def _CreateGPUTimelineMetric(_):
+  return gpu_timeline.GPUTimelineMetric()

[nednguyen, 2015/01/23 23:58:13]

This mean your benchmark will compute gpu_timeline on all the interaction
records in the page. Is this really what you want?

[David Yen, 2015/01/24 00:22:33]

Done. I moved the creation to CreateTimelineBasedMeasurementOptions().

[nednguyen, 2015/01/24 16:43:04]

Sorry,  by "compute gpu_timeline on all the interaction", I meant that you will
get the cpu
metric computed for all the interaction records issued on the page. I was asking
whether this is what you want, or do you want to have some filtering here, i.e:
only return gpu_timeline.GPUTimelineMetric() if your interaction records have
some special flags. Note that no filtering is fine too, but I just want to make
sure you are aware of this. 

[David Yen, 2015/01/26 19:21:27]

No filtering sounds like what we want. I will move the
_CreateGPUTimelineMetric(_) function back to where it was before.

+
+
+class _GPUTimes(benchmark.Benchmark):
+  def CreateTimelineBasedMeasurementOptions(self):
+    cat_string = ','.join(TOPLEVEL_CATEGORIES)
+    cat_filter = tracing_category_filter.TracingCategoryFilter(cat_string)
+    return timeline_based_measurement.Options(
+        overhead_level=cat_filter,
+        get_metric_from_metric_type_callback=_CreateGPUTimelineMetric)
+
+
+@benchmark.Enabled('android')
+class GPUTimesKeyMobileSites(_GPUTimes):
+  """Measures GPU timeline metric on key mobile sites."""
+  page_set = page_sets.KeyMobileSitesSmoothPageSet
+
+
+class GPUTimesTop25Sites(_GPUTimes):
+  """Measures GPU timeline metric for the top 25 sites."""
+  page_set = page_sets.Top25SmoothPageSet