Tab audio indicator: Use animation container on Mac

chrome/browser/ui/cocoa/tabs/tab_strip_controller.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
 #import "chrome/browser/ui/cocoa/tabs/tab_controller_target.h"
 #import "chrome/browser/ui/cocoa/url_drop_target.h"
 #include "chrome/browser/ui/tabs/hover_tab_selector.h"
 
 @class CrTrackingArea;
 @class NewTabButton;
 @class TabContentsController;
 @class TabView;
 @class TabStripDragController;
 @class TabStripView;
 
 class Browser;
 class TabStripModelObserverBridge;
 class TabStripModel;
 
 namespace content {
 class WebContents;
 }
+namespace ui {
+class AnimationContainer;
+}
 
 // The interface for the tab strip controller's delegate.
 // Delegating TabStripModelObserverBridge's events (in lieu of directly
 // subscribing to TabStripModelObserverBridge events, as TabStripController
 // does) is necessary to guarantee a proper order of subviews layout updates,
 // otherwise it might trigger unnesessary content relayout, UI flickering etc.
 @protocol TabStripControllerDelegate
 
 // Stripped down version of TabStripModelObserverBridge:selectTabWithContents.
 - (void)onActivateTabWithContents:(content::WebContents*)contents;
@@ skipping 91 matching lines @@
   // The amount by which to indent the tabs on the sides (to make room for the
   // red/yellow/green and incognito/fullscreen buttons).
   CGFloat leftIndentForControls_;
   CGFloat rightIndentForControls_;
 
   // Is the mouse currently inside the strip;
   BOOL mouseInside_;
 
   // Helper for performing tab selection as a result of dragging over a tab.
   scoped_ptr<HoverTabSelector> hoverTabSelector_;
+
+  scoped_refptr<ui::AnimationContainer> animationContainer_;
 }
 
 @property(nonatomic) CGFloat leftIndentForControls;
 @property(nonatomic) CGFloat rightIndentForControls;
 
 // Initialize the controller with a view and browser that contains
 // everything else we'll need. |switchView| is the view whose contents get
 // "switched" every time the user switches tabs. The children of this view
 // will be released, so if you want them to stay around, make sure
 // you have retained them.
@@ skipping 82 matching lines @@
 
 // Returns the currently active TabContentsController.
 - (TabContentsController*)activeTabContentsController;
 
 @end
 
 // Returns the parent view to use when showing a sheet for a given web contents.
 NSView* GetSheetParentViewForWebContents(content::WebContents* web_contents);
 
 #endif  // CHROME_BROWSER_UI_COCOA_TABS_TAB_STRIP_CONTROLLER_H_