Update extension buttons to Material Design (Mac).

chrome/browser/ui/cocoa/toolbar/toolbar_button_cocoa.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_TOOLBAR_TOOLBAR_BUTTON_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_COCOA_H_
 
 #import <Cocoa/Cocoa.h>
 
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #import "ui/gfx/color_utils.h"
 #include "ui/gfx/vector_icons_public.h"
 
 enum class ToolbarButtonImageBackgroundStyle {
   HOVER,
   HOVER_THEMED,
   PRESSED,
   PRESSED_THEMED,
 };
 
 // NSButton subclass which handles middle mouse clicking.
 @interface ToolbarButton : NSButton<ThemedWindowDrawing>  {
  @protected
   // YES when middle mouse clicks should be handled.
   BOOL handleMiddleClick_;
 }
 
+// Return the size of toolbar buttons.
++ (NSSize)toolbarButtonSize;
 // Whether or not to handle the mouse middle click events.
 @property(assign, nonatomic) BOOL handleMiddleClick;
-// Override point for subclasses to return their icon color.
-- (SkColor)iconColor:(BOOL)themeIsDark;
-// Sets images for each of the ToolbarButton's states from the specified
-// vector icon.
-- (void)setImagesFromIconId:(gfx::VectorIconId)iconId;
-// Override point for subclasses to set the button's icons.
-- (void)resetIcons;
+// Override point for subclasses to return their vector icon id.
+- (gfx::VectorIconId)vectorIconId;
+// Override point for subclasses to return their vector icon color.
+- (SkColor)vectorIconColor:(BOOL)themeIsDark;
+// When in Material Design mode, sets the images for each of the ToolbarButton's
+// states from the specified image.
+- (void)setImage:(NSImage*)anImage;
+// Resets the images for each of the ToolbarButton's states from its vector icon
+// id or its main image. Should only be called when in Material Design mode.
+- (void)resetButtonStateImages;
 @end
 
 @interface ToolbarButton (ExposedForTesting)
 - (BOOL)shouldHandleEvent:(NSEvent*)theEvent;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_BUTTON_COCOA_H_