Add filter function to gpu_times.

tools/telemetry/telemetry/web_perf/metrics/gpu_timeline.py

Index: tools/telemetry/telemetry/web_perf/metrics/gpu_timeline.py
diff --git a/tools/telemetry/telemetry/web_perf/metrics/gpu_timeline.py b/tools/telemetry/telemetry/web_perf/metrics/gpu_timeline.py
index 3b01110298fd8dc998fd92db4efdd733374a1353..acc4b8d4f657dbad07ba1066b2254e69b38312da 100644
--- a/tools/telemetry/telemetry/web_perf/metrics/gpu_timeline.py
+++ b/tools/telemetry/telemetry/web_perf/metrics/gpu_timeline.py
@@ -22,6 +22,16 @@ TRACKED_GL_CONTEXT_NAME = { 'RenderCompositor': 'render_compositor',
                             'Compositor': 'browser_compositor' }
 
 
+class GPUTimelineListOfValues(list_of_scalar_values.ListOfScalarValues):
+  def __init__(self, page, name, values):
+    super(GPUTimelineListOfValues, self).__init__(page, name, 'ms', values)
+
+
+class GPUTimelineValue(scalar.ScalarValue):
+  def __init__(self, page, name, value):
+    super(GPUTimelineValue, self).__init__(page, name, 'ms', value)
+
+
 def _CalculateFrameTimes(events_per_frame, event_data_func):
   """Given a list of events per frame and a function to extract event time data,
      returns a list of frame times."""
@@ -88,18 +98,19 @@ class GPUTimelineMetric(timeline_based_metric.TimelineBasedMetric):
         frame_times_name = '%s_frame_times' % (name)
 
       if durations:
-        results.AddValue(list_of_scalar_values.ListOfScalarValues(
-            results.current_page, frame_times_name, 'ms', durations))
-
-      results.AddValue(scalar.ScalarValue(results.current_page,
-                                          TimelineName(name, src, 'max'),
-                                          'ms', maximum))
-      results.AddValue(scalar.ScalarValue(results.current_page,
-                                          TimelineName(name, src, 'mean'),
-                                          'ms', avg))
-      results.AddValue(scalar.ScalarValue(results.current_page,
-                                          TimelineName(name, src, 'stddev'),
-                                          'ms', stddev))
+        results.AddValue(GPUTimelineListOfValues(results.current_page,
+                                                 frame_times_name,
+                                                 durations))
+
+      results.AddValue(GPUTimelineValue(results.current_page,
+                                        TimelineName(name, src, 'max'),
+                                        maximum))
+      results.AddValue(GPUTimelineValue(results.current_page,
+                                        TimelineName(name, src, 'mean'),
+                                        avg))
+      results.AddValue(GPUTimelineValue(results.current_page,
+                                        TimelineName(name, src, 'stddev'),
+                                        stddev))
 
   def _CalculateGPUTimelineData(self, model):
     """Uses the model and calculates the times for various values for each