mac: Disable CoreAnimation throbbers for now, while I investigate the performance regressions.

chrome/browser/ui/cocoa/tabs/tab_strip_controller.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/tabs/tab_strip_controller.h"
 
 #import <QuartzCore/QuartzCore.h>
 
 #include <cmath>
 #include <limits>
@@ skipping 1593 matching lines @@
       } else if (newState == kTabCrashed) {
         NSImage* oldImage = [[self iconImageViewForContents:contents] image];
         NSRect frame =
             NSMakeRect(0, 0, kIconWidthAndHeight, kIconWidthAndHeight);
         iconView = [ThrobberView toastThrobberViewWithFrame:frame
                                                 beforeImage:oldImage
                                                  afterImage:sadFaviconImage];
         [[tabController mediaIndicatorView]
           updateIndicator:TAB_MEDIA_STATE_NONE];
       } else {
-        iconView =
-            [[[SpriteView alloc] initWithImage:throbberImage] autorelease];
+        NSRect frame =
+            NSMakeRect(0, 0, kIconWidthAndHeight, kIconWidthAndHeight);
+        iconView = [ThrobberView filmstripThrobberViewWithFrame:frame
+                                                          image:throbberImage];
       }
     }
 
     [tabController setIconView:iconView];
     if (iconView) {
       // See the comment above kTabOverlap for why these DCHECKs exist.
       DCHECK_GE(NSMinX([iconView frame]), kTabOverlap);
       // TODO(thakis): Ideally, this would be true too, but it's not true in
       // some tests.
       //DCHECK_LE(NSMaxX([iconView frame]),
@@ skipping 601 matching lines @@
 NSView* GetSheetParentViewForWebContents(WebContents* web_contents) {
   // View hierarchy of the contents view:
   // NSView  -- switchView, same for all tabs
   // +- NSView  -- TabContentsController's view
   //    +- TabContentsViewCocoa
   //
   // Changing it? Do not forget to modify
   // -[TabStripController swapInTabAtIndex:] too.
   return [web_contents->GetView()->GetNativeView() superview];
 }