Reduce the fullscreen window height by 1px on activation loss.

ui/views/win/hwnd_message_handler.h

Index: ui/views/win/hwnd_message_handler.h
diff --git a/ui/views/win/hwnd_message_handler.h b/ui/views/win/hwnd_message_handler.h
index 4b7ab4179a0d2ff5e937d9ff4508ace27043c652..3f7b75278ac6fa40a18f8b03517767e59068c8a3 100644
--- a/ui/views/win/hwnd_message_handler.h
+++ b/ui/views/win/hwnd_message_handler.h
@@ -255,7 +255,10 @@ class VIEWS_EXPORT HWNDMessageHandler :
 
   // Called after the WM_ACTIVATE message has been processed by the default
   // windows procedure.
-  void PostProcessActivateMessage(int activation_state, bool minimized);
+  void PostProcessActivateMessage(
+      int activation_state,
+      bool minimized,
+      HWND window_gaining_or_losing_activation);
 
   // Enables disabled owner windows that may have been disabled due to this
   // window's modality.
@@ -502,6 +505,11 @@ class VIEWS_EXPORT HWNDMessageHandler :
                                   WPARAM w_param,
                                   LPARAM l_param);
 
+  // Helper function for setting the bounds of the HWND. For more information
+  // please refer to the SetBounds() function.
+  void SetBoundsInternal(const gfx::Rect& bounds_in_pixels,
+                         bool force_size_changed);
+
   HWNDMessageHandlerDelegate* delegate_;
 
   scoped_ptr<FullscreenHandler> fullscreen_handler_;
@@ -632,6 +640,10 @@ class VIEWS_EXPORT HWNDMessageHandler :
   // Defaults to false.
   bool left_button_down_on_caption_;
 
+  // Set to true if the window is a background fullscreen window, i.e a
+  // fullscreen window which lost activation. Defaults to false.
+  bool background_fullscreen_hack_;
+
   // The WeakPtrFactories below must occur last in the class definition so they
   // get destroyed last.