Big patch to implement Chromium-side of Gamepad support

content/browser/renderer_host/gamepad_browser_message_filter.cc

 // 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.
 
 #include "content/browser/renderer_host/gamepad_browser_message_filter.h"
 
+#include "content/browser/gamepad/gamepad_service.h"
 #include "content/common/gamepad_messages.h"
 
-GamepadBrowserMessageFilter::GamepadBrowserMessageFilter() {
+namespace content {
+
+GamepadBrowserMessageFilter::GamepadBrowserMessageFilter(
+    content::RenderProcessHost* render_process_host)
+    : gamepad_service_(NULL),
+      render_process_host_(render_process_host) {
 }
 
 GamepadBrowserMessageFilter::~GamepadBrowserMessageFilter() {
 }
 
 bool GamepadBrowserMessageFilter::OnMessageReceived(
     const IPC::Message& message,
     bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(GamepadBrowserMessageFilter,
                            message,
                            *message_was_ok)
     IPC_MESSAGE_HANDLER(GamepadHostMsg_StartPolling, OnGamepadStartPolling)
     IPC_MESSAGE_HANDLER(GamepadHostMsg_StopPolling, OnGamepadStopPolling)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
   return handled;
 }
 
 void GamepadBrowserMessageFilter::OnGamepadStartPolling(
     base::SharedMemoryHandle* renderer_handle) {
-  if (!provider_) {
-    provider_ = new content::GamepadProvider(NULL);
-    provider_->Start();
-  }
-  *renderer_handle = provider_->GetRendererSharedMemoryHandle(peer_handle());
+  if (!gamepad_service_)
+    gamepad_service_ = GamepadService::GetInstance();
+  gamepad_service_->Start(NULL, render_process_host_);
+  *renderer_handle = gamepad_service_->GetSharedMemoryHandle(peer_handle());
 }
 
 void GamepadBrowserMessageFilter::OnGamepadStopPolling() {
-  // TODO(scottmg) Remove this message entirely?
-  // Stop is currently handled by the refcount on provider_.
+  // TODO(scottmg): Probably get rid of this message. We can't trust it will
+  // arrive anyway if the renderer crashes, etc.
 }
+
+} // namespace content