[Extensions UI] Use the ExtensionMessageBubbleBridge for Views platforms

chrome/browser/ui/cocoa/extensions/toolbar_actions_bar_bubble_mac.h

 // Copyright 2015 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_EXTENSIONS_TOOLBAR_ACTIONS_BAR_BUBBLE_MAC_H_
 #define CHROME_BROWSER_UI_COCOA_EXTENSIONS_TOOLBAR_ACTIONS_BAR_BUBBLE_MAC_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include <memory>
 
 #import "chrome/browser/ui/cocoa/base_bubble_controller.h"
 
 class ToolbarActionsBarBubbleDelegate;
 
 // A bubble that hangs off the toolbar actions bar, with a minimum of a heading,
 // some text content, and an "action" button. The bubble can also, optionally,
 // have a learn more link and/or a dismiss button.
 @interface ToolbarActionsBarBubbleMac : BaseBubbleController {
   // Whether or not the bubble has been acknowledged.
   BOOL acknowledged_;
 
+  // True if the bubble is anchored to an action in the toolbar actions bar.
+  BOOL anchoredToAction_;
+
   // The action button. The exact meaning of this is dependent on the bubble.
   // Required.
   NSButton* actionButton_;
 
   // The list of items to display. Optional.
   NSTextField* itemList_;
 
   // The dismiss button. Optional.
   NSButton* dismissButton_;
 
   // The "learn more" link-style button. Optional.
   NSButton* learnMoreButton_;
 
   // This bubble's delegate.
   std::unique_ptr<ToolbarActionsBarBubbleDelegate> delegate_;
 }
 
 // Creates the bubble for a parent window but does not show it.
 - (id)initWithParentWindow:(NSWindow*)parentWindow
                anchorPoint:(NSPoint)anchorPoint
+          anchoredToAction:(BOOL)anchoredToAction
                   delegate:(std::unique_ptr<ToolbarActionsBarBubbleDelegate>)
                                delegate;
 
 // Toggles animation for testing purposes.
 + (void)setAnimationEnabledForTesting:(BOOL)enabled;
 
 @property(readonly, nonatomic) NSButton* actionButton;
 @property(readonly, nonatomic) NSTextField* itemList;
 @property(readonly, nonatomic) NSButton* dismissButton;
 @property(readonly, nonatomic) NSButton* learnMoreButton;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_EXTENSIONS_TOOLBAR_ACTIONS_BAR_BUBBLE_MAC_H_