Schedule idle handler in the foreground tab based on CPU usage and user activity.

content/renderer/idle_user_detector.cc

Index: content/renderer/idle_user_detector.cc
diff --git a/content/renderer/idle_user_detector.cc b/content/renderer/idle_user_detector.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e489fd53724cefcb30c72988a5de117519a5a046
--- /dev/null
+++ b/content/renderer/idle_user_detector.cc
@@ -0,0 +1,34 @@
+// 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/renderer/idle_user_detector.h"
+
+#include "base/logging.h"
+#include "content/common/view_messages.h"
+#include "content/public/renderer/content_renderer_client.h"
+#include "content/renderer/render_thread_impl.h"
+
+IdleUserDetector::IdleUserDetector(content::RenderView* render_view)
+    : content::RenderViewObserver(render_view){
+}
+
+IdleUserDetector::~IdleUserDetector() {
+}
+
+bool IdleUserDetector::OnMessageReceived(const IPC::Message& message) {
+  IPC_BEGIN_MESSAGE_MAP(IdleUserDetector, message)
+    IPC_MESSAGE_HANDLER(ViewMsg_HandleInputEvent, OnHandleInputEvent)
+  IPC_END_MESSAGE_MAP()
+  return false;
+}
+
+void IdleUserDetector::OnHandleInputEvent(const IPC::Message& message) {
+  if (content::GetContentClient()->renderer()->
+          RunIdleHandlerWhenWidgetsHidden()) {
+    RenderThreadImpl* render_thread = RenderThreadImpl::current();
+    if (render_thread != NULL) {
+      render_thread->PostponeIdleNotification();
+    }
+  }
+}