Move power event handling logic from ui/ to base/ on Windows

base/system_monitor/system_monitor.h

Index: base/system_monitor/system_monitor.h
diff --git a/base/system_monitor/system_monitor.h b/base/system_monitor/system_monitor.h
index 6620d27b42d109a65ceb86aaefe730f5e75dd07f..fc19269059df80e111b31ee90270d24d273acfd8 100644
--- a/base/system_monitor/system_monitor.h
+++ b/base/system_monitor/system_monitor.h
@@ -134,13 +134,6 @@ class BASE_EXPORT SystemMonitor {
   // be copied. Any significant addition to this class is blocked on
   // refactoring to improve the state of affairs. See http://crbug.com/149059
 
-#if defined(OS_WIN)
-  // Windows-specific handling of a WM_POWERBROADCAST message.
-  // Embedders of this API should hook their top-level window
-  // message loop and forward WM_POWERBROADCAST through this call.
-  void ProcessWmPowerBroadcastMessage(int event_id);
-#endif
-
   // Cross-platform handling of a power event.
   void ProcessPowerMessage(PowerEvent event_id);
 
@@ -148,11 +141,38 @@ class BASE_EXPORT SystemMonitor {
   void ProcessDevicesChanged(DeviceType device_type);
 
  private:
-#if defined(OS_MACOSX)
+#if defined(OS_MACOSX) || defined(OS_WIN)
   void PlatformInit();
   void PlatformDestroy();
 #endif
 
+#if defined(OS_WIN)
+  // Represents a message-only window for power message handling on Windows. It
+  // has the same life cycle as the SystemMonitor does.
+  class PowerMessageWindow {
+   public:
+    PowerMessageWindow(SystemMonitor* monitor);

[vandebo (ex-Chrome), 2013/02/20 22:30:40]

explicit

[Hongbo Min, 2013/02/21 07:39:08]

No monitor parameter passed to ctor now.

+    ~PowerMessageWindow();
+
+   private:
+    void InitMessageHWND();
+    void ProcessWmPowerBroadcastMessage(int event_id);
+    LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
+                             WPARAM wparam, LPARAM lparam);
+    static LRESULT CALLBACK WndProcThunk(HWND hwnd,
+                                         UINT message,
+                                         WPARAM wparam,
+                                         LPARAM lparam);
+    SystemMonitor* monitor_;
+    // Instance of the module containing the window procedure.
+    HMODULE instance_;
+    // A hidden message-only window.
+    HWND message_hwnd_;
+  };
+
+  scoped_ptr<PowerMessageWindow> power_message_window_;
+#endif
+
   // Platform-specific method to check whether the system is currently
   // running on battery power.  Returns true if running on batteries,
   // false otherwise.