Gamepad API: add support for connection events

content/renderer/gamepad_shared_memory_reader.h

Index: content/renderer/gamepad_shared_memory_reader.h
diff --git a/content/renderer/gamepad_shared_memory_reader.h b/content/renderer/gamepad_shared_memory_reader.h
index 08dc41a8c91e1e9edd7aedbfdf591777e5c78481..3846176107c3fdd3bd9276cac8587dd9878e3a4b 100644
--- a/content/renderer/gamepad_shared_memory_reader.h
+++ b/content/renderer/gamepad_shared_memory_reader.h
@@ -7,23 +7,40 @@
 
 #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_;
 };