tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 51b2c69057a9778abc76969b5c093972495af944..42f5a325e9b7bf17d349a2ca26f4e74226e4b70d 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -38966,6 +38966,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="OffscreenCanvas.CommitType" enum="OffscreenCanvasCommitType">

[Ilya Sherman, 2016/10/11 00:54:11]

It looks like you're adding a new top-level group, "OffscreenCanvas".  Could you
please find an existing top-level group that would be appropriate for this
histogram?  Or are you convinced that there aren't any such groups?

For example, I would suggest "Canvas.Offscreen.CommitType".

[xidachen, 2016/10/11 17:21:16]

Done.

+  <owner>xidachen@chromium.org</owner>
+  <owner>junov@chromium.org</owner>
+  <summary>
+    The type of code path that OffscreenCanvas's commit API goes through.
+  </summary>
+</histogram>
+
 <histogram name="Omnibox.AggressiveHistoryURLProviderFieldTrialBeacon"
     enum="OmniboxAggressiveHistoryURLProviderFieldTrialBeacon">
   <obsolete>
@@ -91715,6 +91723,13 @@ value.
   <int value="4" label="Server offline and stale data not available."/>
 </enum>
 
+<enum name="OffscreenCanvasCommitType" type="int">
+  <int value="0" label="GPUCanvasGPUCompositing"/>
+  <int value="1" label="GPUCanvasSoftwareCompositing"/>
+  <int value="2" label="SoftwareCanvasGPUCompositing"/>
+  <int value="3" label="SoftwareCanvasSoftwareCompositing"/>
+</enum>
+
 <enum name="OmniboxAggressiveHistoryURLProviderFieldTrialBeacon" type="int">
   <int value="0" label="disabled by flags"/>
   <int value="1" label="enabled by flags"/>