Gamepad API: add support for connection events

content/renderer/gamepad_shared_memory_reader.h

 // Copyright (c) 2011 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_GAMEPAD_SHARED_MEMORY_READER_H_
 #define CONTENT_RENDERER_GAMEPAD_SHARED_MEMORY_READER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
+#include "content/common/gamepad_messages.h"
+#include "content/public/renderer/render_process_observer.h"
 #include "third_party/WebKit/public/platform/WebGamepads.h"
 
+namespace blink { class WebGamepadListener; }
+
 namespace content {
 
 struct GamepadHardwareBuffer;
 
-class GamepadSharedMemoryReader {
+class GamepadSharedMemoryReader : public RenderProcessObserver {
  public:
   GamepadSharedMemoryReader();
   virtual ~GamepadSharedMemoryReader();
-  void SampleGamepads(blink::WebGamepads&);
+
+  void SampleGamepads(blink::WebGamepads& gamepads);
+  void SetGamepadListener(blink::WebGamepadListener* listener);
+
+  // RenderProcessObserver implementation.
+  virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
 
  private:
+  void OnGamepadConnected(int index, const blink::WebGamepad& gamepad);
+  void OnGamepadDisconnected(int index, const blink::WebGamepad& gamepad);
+
+  void StartPollingIfNecessary();
+  void StopPollingIfNecessary();
+
   base::SharedMemoryHandle renderer_shared_memory_handle_;
   scoped_ptr<base::SharedMemory> renderer_shared_memory_;
   GamepadHardwareBuffer* gamepad_hardware_buffer_;
+  blink::WebGamepadListener* gamepad_listener_;
 
+  bool is_polling_;
   bool ever_interacted_with_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GAMEPAD_SHARED_MEMORY_READER_H_