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

chrome/browser/custom_handlers/register_protocol_handler_permission_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_CUSTOM_HANDLERS_REGISTER_PROTOCOL_HANDLER_PERMISSION_REQUEST_H_
 #define CHROME_BROWSER_CUSTOM_HANDLERS_REGISTER_PROTOCOL_HANDLER_PERMISSION_REQUEST_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/website_settings/permission_bubble_request.h"
 #include "chrome/common/custom_handlers/protocol_handler.h"
 
 class ProtocolHandlerRegistry;
 
 // This class provides display data for a permission bubble request, shown when
 // a page wants to register a protocol handler and was triggered by a user
 // action.
 class RegisterProtocolHandlerPermissionRequest
     : public PermissionBubbleRequest {
  public:
   RegisterProtocolHandlerPermissionRequest(
       ProtocolHandlerRegistry* registry,
       const ProtocolHandler& handler,
       GURL url,
       bool user_gesture);
   ~RegisterProtocolHandlerPermissionRequest() override;
 
+ private:
   // PermissionBubbleRequest:
   gfx::VectorIconId GetVectorIconId() const override;
   int GetIconId() const override;
   base::string16 GetMessageText() const override;
   base::string16 GetMessageTextFragment() const override;
   GURL GetOrigin() const override;
   void PermissionGranted() override;
   void PermissionDenied() override;
   void Cancelled() override;
   void RequestFinished() override;
+  PermissionBubbleType GetPermissionBubbleType() const override;
 
- private:
   ProtocolHandlerRegistry* registry_;
   ProtocolHandler handler_;
   GURL origin_;
 
   DISALLOW_COPY_AND_ASSIGN(RegisterProtocolHandlerPermissionRequest);
 };
 
 #endif  // CHROME_BROWSER_CUSTOM_HANDLERS_REGISTER_PROTOCOL_HANDLER_PERMISSION_REQUEST_H_