Revert "Refactor code listening to platform events in content/renderer/."

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 68828f67cb87210463264b595da4765f758ac17b..25bd1844dc98cdbe74295ecae127bc6e4030298c 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -36,6 +36,7 @@ struct WorkerProcessMsg_CreateWorker_Params;
 
 namespace blink {
 class WebGamepads;
+class WebGamepadListener;
 class WebGraphicsContext3D;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
@@ -83,6 +84,7 @@ class DBMessageFilter;
 class DevToolsAgentFilter;
 class DomStorageDispatcher;
 class EmbeddedWorkerDispatcher;
+class GamepadSharedMemoryReader;
 class GpuChannelHost;
 class IndexedDBDispatcher;
 class InputEventFilter;
@@ -288,6 +290,10 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
     return vc_manager_.get();
   }
 
+  GamepadSharedMemoryReader* gamepad_shared_memory_reader() const {
+    return gamepad_shared_memory_reader_.get();
+  }
+
   // Get the GPU channel. Returns NULL if the channel is not established or
   // has been lost.
   GpuChannelHost* GetGpuChannel();
@@ -385,6 +391,10 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
   // Retrieve current gamepad data.
   void SampleGamepads(blink::WebGamepads* data);
 
+  // Set a listener for gamepad connected/disconnected events.
+  // A non-null listener must be set first before calling SampleGamepads.
+  void SetGamepadListener(blink::WebGamepadListener* listener);
+
   // Called by a RenderWidget when it is created or destroyed. This
   // allows the process to know when there are no visible widgets.
   void WidgetCreated();
@@ -560,6 +570,8 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
   scoped_ptr<WebRTCIdentityService> webrtc_identity_service_;
 #endif
 
+  scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
+
   // TODO(reveman): Allow AllocateGpuMemoryBuffer to be called from
   // multiple threads. Current allocation mechanism for IOSurface
   // backed GpuMemoryBuffers prevent this. crbug.com/325045