[Extensions Toolbar Mac] Allow the overflow toolbar to use the theme provider

chrome/browser/ui/cocoa/image_button_cell.h

 // Copyright (c) 2011 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_BROWSER_UI_COCOA_IMAGE_BUTTON_CELL_H_
 #define CHROME_BROWSER_UI_COCOA_IMAGE_BUTTON_CELL_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/scoped_nsobject.h"
 
+namespace ui {
+class ThemeProvider;
+}
+
 namespace image_button_cell {
 
 // Possible states
 enum ButtonState {
   kDefaultState = 0,
   kHoverState,
   kPressedState,
   kDisabledState,
   // The same as above, but for non-main, non-key windows.
   kDefaultStateBackground,
@@ skipping 35 matching lines @@
 - (void)setImageID:(NSInteger)imageID
     forButtonState:(image_button_cell::ButtonState)state;
 
 // Sets the image for the given button state using an image.
 - (void)setImage:(NSImage*)image
   forButtonState:(image_button_cell::ButtonState)state;
 
 // Gets the alpha to use to draw the button for the current window focus state.
 - (CGFloat)imageAlphaForWindowState:(NSWindow*)window;
 
+// Returns the theme provider for the given |window|; this allows subclasses to
+// pass in a different theme provider to use if appropriate.
+- (ui::ThemeProvider*)themeProviderForWindow:(NSWindow*)window;
+
 // Draws the cell's image within |cellFrame|.
 - (void)drawImageWithFrame:(NSRect)cellFrame inView:(NSView*)controlView;
 
 // If |controlView| is a first responder then draws a blue focus ring.
 - (void)drawFocusRingWithFrame:(NSRect)cellFrame inView:(NSView*)controlView;
 
 @end
 
 #endif // CHROME_BROWSER_UI_COCOA_IMAGE_BUTTON_CELL_H_