refactor EnumerateDevices to make it a persistent request.

content/renderer/pepper/pepper_plugin_delegate_impl.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_DELEGATE_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_DELEGATE_IMPL_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 359 matching lines @@
   virtual void DidChangeCursor(webkit::ppapi::PluginInstance* instance,
                                const WebKit::WebCursorInfo& cursor) OVERRIDE;
   virtual void DidReceiveMouseEvent(
       webkit::ppapi::PluginInstance* instance) OVERRIDE;
   virtual bool IsInFullscreenMode() OVERRIDE;
   virtual void SampleGamepads(WebKit::WebGamepads* data) OVERRIDE;
   virtual bool IsPageVisible() const OVERRIDE;
   virtual int EnumerateDevices(
       PP_DeviceType_Dev type,
       const EnumerateDevicesCallback& callback) OVERRIDE;
+  virtual void StopEnumerateDevices(int request_id) OVERRIDE;
   virtual webkit_glue::ClipboardClient* CreateClipboardClient() const OVERRIDE;
   virtual std::string GetDeviceID() OVERRIDE;
   virtual PP_FlashLSORestrictions GetLocalDataRestrictions(
       const GURL& document_url,
       const GURL& plugin_url) OVERRIDE;
 
   // RenderViewObserver implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void OnDestruct() OVERRIDE;
 
@@ skipping 122 matching lines @@
 
   scoped_ptr<PepperDeviceEnumerationEventHandler>
       device_enumeration_event_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPluginDelegateImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLUGIN_DELEGATE_IMPL_H_