Mac: Make it easier for views to correctly draw with a theme.

chrome/browser/ui/cocoa/floating_bar_backing_view.mm

 // 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.
 
 #include "chrome/browser/ui/cocoa/floating_bar_backing_view.h"
 
 #import "chrome/browser/ui/cocoa/framed_browser_window.h"
 #import "ui/base/cocoa/appkit_utils.h"
 
 @implementation FloatingBarBackingView
@@ skipping 27 matching lines @@
 - (void)otherMouseDragged:(NSEvent*)event {}
 
 // Eat this too, except that ...
 - (void)mouseUp:(NSEvent*)event {
   // a double-click in the blank area should try to minimize, to be consistent
   // with double-clicks on the contiguous tab strip area. (It'll fail and beep.)
   if ([event clickCount] == 2)
     ui::WindowTitlebarReceivedDoubleClick([self window], self);
 }
 
+// ThemedWindowDrawing implementation.
+
+- (void)windowDidChangeTheme {
+  [self setNeedsDisplay:YES];
+}
+
+- (void)windowDidChangeActive {
+  [self setNeedsDisplay:YES];
+}
+
 @end  // @implementation FloatingBarBackingView