chromeos: Add operations to monitor the screen orientation.

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 "chrome/browser/chromeos/chrome_browser_main_chromeos.h"
 
+#include "base/bind.h"
+#include "base/callback.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop.h"
 #include "chrome/browser/chromeos/boot_times_loader.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/net/cros_network_change_notifier_factory.h"
+#include "chrome/browser/chromeos/sensors_source_chromeos.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/common/chrome_switches.h"
 #include "content/common/main_function_params.h"
 #include "net/base/network_change_notifier.h"
 
 #include <gtk/gtk.h>
 
+namespace {
+
+// Queued in PostMainMessageLoopStart. Needs to run after the IO thread is
+// available via BrowserThread, as this is used by SensorsSourceChromeos.
+void DoDeferredSensorsInit(sensors::SensorsSourceChromeos* source) {
+  if (!source->Init())
+    LOG(WARNING) << "Failed to initialize sensors source.";
+}
+
+}  // namespace
+
 class MessageLoopObserver : public MessageLoopForUI::Observer {
   virtual void WillProcessEvent(GdkEvent* event) {
     // On chromeos we want to map Alt-left click to right click.
     // This code only changes presses and releases. We could decide to also
     // modify drags and crossings. It doesn't seem to be a problem right now
     // with our support for context menus (the only real need we have).
     // There are some inconsistent states both with what we have and what
     // we would get if we added drags. You could get a right drag without a
     // right down for example, unless we started synthesizing events, which
     // seems like more trouble than it's worth.
@@ skipping 56 matching lines @@
   // Replace the default NetworkChangeNotifierFactory with ChromeOS specific
   // implementation.
   net::NetworkChangeNotifier::SetFactory(
       new chromeos::CrosNetworkChangeNotifierFactory());
 }
 
 void ChromeBrowserMainPartsChromeos::PostMainMessageLoopStart() {
   ChromeBrowserMainPartsPosix::PostMainMessageLoopStart();
   MessageLoopForUI* message_loop = MessageLoopForUI::current();
   message_loop->AddObserver(g_message_loop_observer.Pointer());
+
+  if (parameters().command_line_.HasSwitch(switches::kEnableSensors)) {
+    sensors_source_ = new sensors::SensorsSourceChromeos();
+    // This initialization needs to be performed after BrowserThread::FILE is
+    // started. Post it into the current (UI) message loop, so that will be
+    // deferred until after browser main.
+    message_loop->PostTask(FROM_HERE,
+                           base::Bind(&DoDeferredSensorsInit, sensors_source_));
+  }
 }