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

chrome/browser/ui/website_settings/permission_bubble_request.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_WEBSITE_SETTINGS_PERMISSION_BUBBLE_REQUEST_H_
 #define CHROME_BROWSER_UI_WEBSITE_SETTINGS_PERMISSION_BUBBLE_REQUEST_H_
 
 #include "base/strings/string16.h"
 #include "url/gurl.h"
 
 namespace gfx {
 enum class VectorIconId;
 }
 
+// Used for UMA to record the types of permission prompts shown.
+// This corresponds to the PermissionBubbleType enum in
+// src/tools/metrics/histograms.xml. The usual rules of updating UMA values
+// applies to this enum:
+// - don't remove values
+// - only ever add values at the end
+// - keep the PermissionBubbleType enum in sync with this definition.
+enum class PermissionBubbleType {
+  UNKNOWN,
+  MULTIPLE,
+  PERMISSION,
+  QUOTA,
+  DOWNLOAD,
+  MEDIA_STREAM,
+  REGISTER_PROTOCOL_HANDLER,
+  // NUM must be the last value in the enum.
+  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
 // from the bubble. It should live until it is unregistered or until
 // RequestFinished is called.
 // Note that no particular guarantees are made about what exact UI surface
 // is presented to the user. The delegate may be coalesced with other bubble
 // requests, or depending on the situation, not shown at all.
 class PermissionBubbleRequest {
  public:
@@ skipping 30 matching lines @@
   // Called when the user has cancelled the permission request. This
   // corresponds to a denial, but is segregated in case the context needs to
   // be able to distinguish between an active refusal or an implicit refusal.
   virtual void Cancelled() = 0;
 
   // The bubble this request was associated with was answered by the user.
   // It is safe for the request to be deleted at this point -- it will receive
   // 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_