Add a new metric for how many times permissions prompts are shown.

chrome/browser/ui/website_settings/permission_bubble_request.h

Index: chrome/browser/ui/website_settings/permission_bubble_request.h
diff --git a/chrome/browser/ui/website_settings/permission_bubble_request.h b/chrome/browser/ui/website_settings/permission_bubble_request.h
index 9da18802c0140d08db1ec94f16a90e49603ec84c..412aea8b565454a9520ffa74cd08bfb570aa0760 100644
--- a/chrome/browser/ui/website_settings/permission_bubble_request.h
+++ b/chrome/browser/ui/website_settings/permission_bubble_request.h
@@ -12,6 +12,18 @@ namespace gfx {
 enum class VectorIconId;
 }
 
+// Used for UMA to record the types of permission prompts shown.

[tsergeant, 2016/04/15 00:54:10]

Maybe add a note that this corresponds to the PermissionPromptType histograms
enum?

[benwells, 2016/04/18 01:02:06]

Done.

+enum class PermissionBubbleType {
+  UNKNOWN,
+  MULTIPLE,
+  PERMISSION,
+  QUOTA,
+  DOWNLOAD,
+  MEDIA_STREAM,
+  REGISTER_PROTOCOL_HANDLER,
+  NUM
+};
+
 // Describes the interface a feature utilizing permission bubbles should
 // implement. A class of this type is registered with the permission bubble
 // manager to receive updates about the result of the permissions request
@@ -62,6 +74,8 @@ class PermissionBubbleRequest {
   // no further message from the permission bubble system. This method will
   // eventually be called on every request which is not unregistered.
   virtual void RequestFinished() = 0;
+
+  virtual PermissionBubbleType GetPermissionBubbleType() const;
 };
 
 #endif  // CHROME_BROWSER_UI_WEBSITE_SETTINGS_PERMISSION_BUBBLE_REQUEST_H_