Support DWM switching....

chrome/views/view.h

 // Copyright (c) 2006-2008 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 CHROME_VIEWS_VIEW_H_
 #define CHROME_VIEWS_VIEW_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_WIN)
@@ skipping 977 matching lines @@
 
  protected:
   // The id of this View. Used to find this View.
   int id_;
 
   // The group of this view. Some view subclasses use this id to find other
   // views of the same group. For example radio button uses this information
   // to find other radio buttons.
   int group_;
 
+  // Called when the UI theme has changed, overriding allows individual Views to
+  // do special cleanup and processing (such as dropping resource caches).
+  // Subclasses that override this method must call the base class
+  // implementation to ensure child views are processed.
+  // Can only be called by subclasses. To dispatch a theme changed notification,
+  // call this method on the RootView.
+  virtual void ThemeChanged();
+
 #ifndef NDEBUG
   // Returns true if the View is currently processing a paint.
   virtual bool IsProcessingPaint() const;
 #endif
 
   // Returns the location, in screen coordinates, to show the context menu at
   // when the context menu is shown from the keyboard. This implementation
   // returns the middle of the visible region of this view.
   //
   // This method is invoked when the context menu is shown by way of the
@@ skipping 317 matching lines @@
   // is going to be flipped horizontally (using the appropriate transform) on
   // right-to-left locales for this View.
   bool flip_canvas_on_paint_for_rtl_ui_;
 
   DISALLOW_COPY_AND_ASSIGN(View);
 };
 
 }  // namespace views
 
 #endif  // CHROME_VIEWS_VIEW_H_