Gamepad API support for chrome on android

content/browser/renderer_host/gamepad_browser_message_filter.cc

Index: content/browser/renderer_host/gamepad_browser_message_filter.cc
diff --git a/content/browser/renderer_host/gamepad_browser_message_filter.cc b/content/browser/renderer_host/gamepad_browser_message_filter.cc
index 6b5972e5a0af5c99d147919d022c3abe6456ce1d..77a0b3e3cea4b23ccf34c4eb28f223262e6ea75a 100644
--- a/content/browser/renderer_host/gamepad_browser_message_filter.cc
+++ b/content/browser/renderer_host/gamepad_browser_message_filter.cc
@@ -1,9 +1,10 @@
 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/time/time.h"
 #include "content/browser/renderer_host/gamepad_browser_message_filter.h"
-
 #include "content/browser/gamepad/gamepad_service.h"
 #include "content/common/gamepad_messages.h"
 
@@ -28,6 +29,12 @@ bool GamepadBrowserMessageFilter::OnMessageReceived(
                            *message_was_ok)
     IPC_MESSAGE_HANDLER(GamepadHostMsg_StartPolling, OnGamepadStartPolling)
     IPC_MESSAGE_HANDLER(GamepadHostMsg_StopPolling, OnGamepadStopPolling)
+#if defined(OS_ANDROID)
+    IPC_MESSAGE_HANDLER(GamepadHostMsg_ResumePolling, OnGamepadResumePolling)
+    IPC_MESSAGE_HANDLER(GamepadHostMsg_PausePolling, OnGamepadPausePolling)
+    IPC_MESSAGE_HANDLER(GamepadHostMsg_UpdateTimestamp,
+                                                    OnGamepadUpdateTimestamp)
+#endif
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
   return handled;
@@ -57,4 +64,37 @@ void GamepadBrowserMessageFilter::OnGamepadStopPolling() {
   }
 }
 
+#if defined(OS_ANDROID)
+void GamepadBrowserMessageFilter::OnGamepadResumePolling() {
+  // The renderer will put the background polling thread to resume state.
+  if (is_started_ && GamepadService::GetInstance()->GetPollState()) {
+    GamepadService::GetInstance()->Resume();
+  } else {
+    NOTREACHED();
+  }
+}
+
+void GamepadBrowserMessageFilter::OnGamepadPausePolling() {
+  // The renderer will put the background polling thread to pause state.
+  if (is_started_ && !GamepadService::GetInstance()->GetPollState()) {
+    GamepadService::GetInstance()->Pause();
+  } else {
+    NOTREACHED();
+  }
+}
+
+void GamepadBrowserMessageFilter::OnGamepadUpdateTimestamp() {
+  // The renderer will set the timestamp for last gamepad data access. This way
+  // the polling thread can be put to pause state when webpage stops accessing
+  // data i.e browser minimize or tab change.
+  // TODO: Currently this approach is expensive. We need to get rid of this
+  // message and set the polling thread to pause state everytime gamepad data
+  // access stops. One possible way is tracking the focus change on the
+  // webpage.
+  GamepadService::GetInstance()->SetGamepadAccessTimestamp(
+                                            base::Time::NowFromSystemTime());
+  OnGamepadResumePolling();
+}
+#endif
+
 }  // namespace content