Make base::PowerMonitor work on Chrome OS.

base/power_monitor/power_monitor_device_source.h

 // Copyright 2013 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.
 
 #ifndef BASE_POWER_MONITOR_POWER_MONITOR_DEVICE_SOURCE_H_
 #define BASE_POWER_MONITOR_POWER_MONITOR_DEVICE_SOURCE_H_
 
 #include "base/base_export.h"
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
@@ skipping 33 matching lines @@
   //
   // This function must be called before instantiating an instance of the class
   // and before the Sandbox is initialized.
 #if !defined(OS_IOS)
   static void AllocateSystemIOPorts();
 #else
   static void AllocateSystemIOPorts() {}
 #endif  // OS_IOS
 #endif  // OS_MACOSX
 
+#if defined(OS_CHROMEOS)
+  // On Chrome OS, Chrome receives power-related events from powerd, the system
+  // power daemon, via D-Bus signals received on the UI thread. base can't
+  // directly depend on that code, so this class instead exposes static methods
+  // so that events can be passed in.
+  static void SetPowerSource(bool on_battery);
+  static void HandleSystemSuspending();
+  static void HandleSystemResumed();
+#endif
+
  private:
 #if defined(OS_WIN)
   // Represents a message-only window for power message handling on Windows.
   // Only allow PowerMonitor to create it.
   class PowerMessageWindow {
    public:
     PowerMessageWindow();
     ~PowerMessageWindow();
 
    private:
@@ skipping 34 matching lines @@
 #if defined(OS_WIN)
   PowerMessageWindow power_message_window_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(PowerMonitorDeviceSource);
 };
 
 }  // namespace base
 
 #endif  // BASE_POWER_MONITOR_POWER_MONITOR_DEVICE_SOURCE_H_