Remove fade animation on tab-switch when using the 10.9 SDK

content/browser/renderer_host/render_widget_host_view_mac.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.
 
 #include "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 
@@ skipping 811 matching lines @@
   if (!render_widget_host_)
     return;
   render_widget_host_->NotifyScreenInfoChanged();
 }
 
 RenderWidgetHost* RenderWidgetHostViewMac::GetRenderWidgetHost() const {
   return render_widget_host_;
 }
 
 void RenderWidgetHostViewMac::Show() {
+  ScopedCAActionDisabler disabler;
   [cocoa_view_ setHidden:NO];
   if (!render_widget_host_->is_hidden())
     return;
 
   WasUnOccluded();
 
   // If there is not a frame being currently drawn, kick one, so that the below
   // pause will have a frame to wait on.
   render_widget_host_->ScheduleComposite();
   PauseForPendingResizeOrRepaintsAndDraw();
 }
 
 void RenderWidgetHostViewMac::Hide() {
+  ScopedCAActionDisabler disabler;
   [cocoa_view_ setHidden:YES];
   WasOccluded();
   DestroySuspendedBrowserCompositorViewIfNeeded();
 }
 
 void RenderWidgetHostViewMac::WasUnOccluded() {
   if (!render_widget_host_->is_hidden())
     return;
 
   ui::LatencyInfo renderer_latency_info;
@@ skipping 2576 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end