Support None value for telemetry values.

tools/telemetry/telemetry/web_perf/metrics/rendering_stats_unittest.py

Index: tools/telemetry/telemetry/web_perf/metrics/rendering_stats_unittest.py
diff --git a/tools/telemetry/telemetry/web_perf/metrics/rendering_stats_unittest.py b/tools/telemetry/telemetry/web_perf/metrics/rendering_stats_unittest.py
index d4f77af1c1aa50427167bb73599df3cd965a29ee..04ce19c40f317bea208c484c641bdaea1915cac9 100644
--- a/tools/telemetry/telemetry/web_perf/metrics/rendering_stats_unittest.py
+++ b/tools/telemetry/telemetry/web_perf/metrics/rendering_stats_unittest.py
@@ -17,7 +17,6 @@ from telemetry.web_perf.metrics.rendering_stats import (
     ComputeInputEventLatencies)
 from telemetry.web_perf.metrics.rendering_stats import GetInputLatencyEvents
 from telemetry.web_perf.metrics.rendering_stats import HasRenderingStats
-from telemetry.web_perf.metrics.rendering_stats import NotEnoughFramesError
 from telemetry.web_perf.metrics.rendering_stats import RenderingStats
 
 
@@ -252,46 +251,6 @@ class RenderingStatsUnitTest(unittest.TestCase):
     process_with_frames.FinalizeImport()
     self.assertTrue(HasRenderingStats(thread_with_frames))
 
-  def testRangeWithoutFrames(self):
-    timer = MockTimer()
-    timeline = model.TimelineModel()
-
-    # Create a renderer process, with a main thread and impl thread.
-    renderer = timeline.GetOrCreateProcess(pid = 2)
-    renderer_main = renderer.GetOrCreateThread(tid = 21)
-    renderer_compositor = renderer.GetOrCreateThread(tid = 22)
-
-    # Create 10 main and impl rendering stats events for Action A.
-    timer.Advance(2, 4)
-    renderer_main.BeginSlice('webkit.console', 'ActionA', timer.Get(), '')
-    for i in xrange(0, 10):
-      first = (i == 0)
-      AddMainThreadRenderingStats(timer, renderer_main, first, None)
-      AddImplThreadRenderingStats(timer, renderer_compositor, first, None)
-    timer.Advance(2, 4)
-    renderer_main.EndSlice(timer.Get())
-
-    # Create 5 main and impl rendering stats events not within any action.
-    for i in xrange(0, 5):
-      first = (i == 0)
-      AddMainThreadRenderingStats(timer, renderer_main, first, None)
-      AddImplThreadRenderingStats(timer, renderer_compositor, first, None)
-
-    # Create Action B without any frames. This should trigger
-    # NotEnoughFramesError when the RenderingStats object is created.
-    timer.Advance(2, 4)
-    renderer_main.BeginSlice('webkit.console', 'ActionB', timer.Get(), '')
-    timer.Advance(2, 4)
-    renderer_main.EndSlice(timer.Get())
-
-    renderer.FinalizeImport()
-
-    timeline_markers = timeline.FindTimelineMarkers(['ActionA', 'ActionB'])
-    timeline_ranges = [ timeline_bounds.Bounds.CreateFromEvent(marker)
-                        for marker in timeline_markers ]
-    self.assertRaises(NotEnoughFramesError, RenderingStats,
-                      renderer, None, timeline_ranges)
-
   def testFromTimeline(self):
     timeline = model.TimelineModel()