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

ui/views/win/hwnd_message_handler_delegate.h

 // Copyright (c) 2012 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 UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_
 
 #include "ui/views/views_export.h"
 
 namespace gfx {
@@ skipping 76 matching lines @@
   // implementing them on non-aura windows. http://crbug.com/189112.
   virtual bool ShouldHandleSystemCommands() const = 0;
 
   // TODO(beng): Investigate migrating these methods to On* prefixes once
   // HWNDMessageHandler is the WindowImpl.
 
   // Called when another app was activated.
   virtual void HandleAppDeactivated() = 0;
 
   // Called when the window was activated or deactivated. |active| reflects the
-  // new state.
-  virtual void HandleActivationChanged(bool active) = 0;
+  // new state. |window_gaining_or_losing_activation| is the window gaining or
+  // losing activation.
+  virtual void HandleActivationChanged(
+      bool active,
+      HWND window_gaining_or_losing_activation) = 0;
 
   // Called when a well known "app command" from the system was performed.
   // Returns true if the command was handled.
   virtual bool HandleAppCommand(short command) = 0;
 
   // Called from WM_CANCELMODE.
   virtual void HandleCancelMode() = 0;
 
   // Called when the window has lost mouse capture.
   virtual void HandleCaptureLost() = 0;
@@ skipping 119 matching lines @@
   // Called when the window size has finished changing.
   virtual void HandleWindowSizeChanged() = 0;
 
  protected:
   virtual ~HWNDMessageHandlerDelegate() {}
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_