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

content/renderer/idle_user_detector.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/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/public/renderer/render_thread.h"
+
+using content::RenderThread;
+
+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()) {

[ulan, 2011/11/16 14:14:46]

I use "RunIdleHandlerWhenWidgetsHidden" as an indicator of whether the renderer
belongs to an extension or not.
Should I rename it to "IsExtension"?

[Matt Perry, 2011/11/16 19:23:52]

I think you can just call PostponeIdleNotification() for extensions as well. If
an extension receives an input event, that's an indication it is not idle.

[ulan, 2011/11/16 20:13:22]

I will do it in the second CL which will simplify idle handler scheduling for
background tabs and extensions.

+    RenderThread::Get()->PostponeIdleNotification();
+  }
+}