Add Rappor reporting for grant/deny/cancel/ignore of Mediastream permissions

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 a3bb404bbbbc41aa50823159b294eba77f5d9e44..519725623e810786e6714ee61633fef718d542d0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -17537,6 +17537,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="Media.DevicePermissionActions" enum="DevicePermissionActions">
+  <obsolete>
+    Removed 10/2015 in favor of ContentSettings.PermissionActions.
+  </obsolete>
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <summary>
     Measures the actions taken in the media infobar, which prompts the users for
@@ -78681,6 +78684,8 @@ To add a new entry, add it with any value and run test to compute valid value.
   <suffix name="Geolocation" label="Geolocation permission actions"/>
   <suffix name="ProtectedMedia" label="Protected media permission actions"/>
   <suffix name="DurableStorage" label="Durable Storage permission actions"/>
+  <suffix name="MediaStreamCamera" label="Camera permission actions"/>
+  <suffix name="MediaStreamMic" label="Microphone permission actions"/>

[mlamouri (slow - plz ping), 2015/10/19 10:42:19]

nit: could you name these AudioCapture and VideoCapture?

[tsergeant, 2015/10/20 06:38:43]

Done.

   <affected-histogram name="ContentSettings.PermissionActions"/>
   <affected-histogram name="ContentSettings.PermissionActionsInsecureOrigin"/>
   <affected-histogram name="ContentSettings.PermissionActionsSecureOrigin"/>