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

chrome/browser/ui/cocoa/bookmarks/bookmark_button.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.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_button.h"
 
 #include <cmath>
 
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
@@ skipping 398 matching lines @@
   // CoreAnimation is enabled.
   return YES;
 }
 
 - (void)drawRect:(NSRect)rect {
   NSView* bookmarkBarToolbarView = [[self superview] superview];
   [self cr_drawUsingAncestor:bookmarkBarToolbarView inRect:(NSRect)rect];
   [super drawRect:rect];
 }
 
+// ThemedWindowDrawing implementation.
+
+- (void)windowDidChangeTheme {
+  [self setNeedsDisplay:YES];
+}
+
+- (void)windowDidChangeActive {
+  [self setNeedsDisplay:YES];
+}
+
 @end
 
 @implementation BookmarkButton(Private)
 
 
 - (void)installCustomTrackingArea {
   const NSTrackingAreaOptions options =
       NSTrackingActiveAlways |
       NSTrackingMouseEnteredAndExited |
       NSTrackingEnabledDuringMouseDrag;
@@ skipping 27 matching lines @@
   [[cell clipPathForFrame:bounds inView:self] setClip];
   [cell drawWithFrame:bounds inView:self];
 
   CGContextEndTransparencyLayer(cgContext);
   [image unlockFocus];
 
   return image.autorelease();
 }
 
 @end  // @implementation BookmarkButton(Private)