Implement the gamepad API in the IPC proxy

ppapi/proxy/gamepad_resource.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 PPAPI_PROXY_GAMEPAD_RESOURCE_H_
 #define PPAPI_PROXY_GAMEPAD_RESOURCE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
+#include "ppapi/c/ppb_gamepad.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/shared_impl/ppb_gamepad_shared.h"
 #include "ppapi/thunk/ppb_gamepad_api.h"
 
 struct PP_GamepadsSampleData;
 
 namespace base {
 class SharedMemory;
 }
 
 namespace ppapi {
 namespace proxy {
@@ skipping 10 matching lines @@
   virtual ~GamepadResource();
 
   // PPB_Gamepad_API.
   virtual void Sample(PP_GamepadsSampleData* data) OVERRIDE;
 
  private:
   // PluginResource override.
   virtual void OnReplyReceived(const ResourceMessageReplyParams& params,
                                const IPC::Message& msg) OVERRIDE;
 
-  void OnPluginMsgSendMemory(const ResourceMessageReplyParams& params,
-                             base::SharedMemoryHandle shared_memory_handle);
+  void OnPluginMsgSendMemory(const ResourceMessageReplyParams& params);
 
   scoped_ptr<base::SharedMemory> shared_memory_;
-  void* buffer_;
+  const ContentGamepadHardwareBuffer* buffer_;
+
+  // Last data returned so we can use this in the event of a read failure.
+  PP_GamepadsSampleData last_read_;
 
   DISALLOW_COPY_AND_ASSIGN(GamepadResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_GAMEPAD_RESOURCE_H_