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

chrome/browser/permissions/permission_context_uma_util.h

Index: chrome/browser/permissions/permission_context_uma_util.h
diff --git a/chrome/browser/permissions/permission_context_uma_util.h b/chrome/browser/permissions/permission_context_uma_util.h
index 05130bacf2b397ac5a05d41fce0eff8fef34e9af..072fbd844df4a114910f0369c5f7bae0b1aab433 100644
--- a/chrome/browser/permissions/permission_context_uma_util.h
+++ b/chrome/browser/permissions/permission_context_uma_util.h
@@ -11,6 +11,22 @@
 class GURL;
 class Profile;
 
+// Enum for UMA purposes, make sure you update histograms.xml if you add new
+// permission actions. Never delete or reorder an entry; only add new entries
+// immediately before PERMISSION_NUM
+enum PermissionAction {
+  GRANTED = 0,
+  DENIED = 1,
+  DISMISSED = 2,
+  IGNORED = 3,
+  REVOKED = 4,
+  REENABLED = 5,
+  REQUESTED = 6,
+
+  // Always keep this at the end.
+  PERMISSION_ACTION_NUM,
+};
+
 // Provides a convenient way of logging UMA for permission related
 // operations.
 class PermissionContextUmaUtil {