Disable CoreAnimation by default

ui/base/cocoa/underlay_opengl_hosting_window.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 "ui/base/cocoa/underlay_opengl_hosting_window.h"
 
 #import <objc/runtime.h>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 15 matching lines @@
 // on the right and left edge of the window.
 - (void)_setContentHasShadow:(BOOL)shadow;
 @end
 
 @interface OpaqueView : NSView
 @end
 
 namespace {
 
 bool CoreAnimationIsEnabled() {
-  static bool is_enabled = !CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kDisableCoreAnimation);
+  static bool is_enabled = CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableCoreAnimation);
   return is_enabled;
 }
 
 NSComparisonResult OpaqueViewsOnTop(id view1, id view2, void* context) {
   BOOL view_1_is_opaque_view = [view1 isKindOfClass:[OpaqueView class]];
   BOOL view_2_is_opaque_view = [view2 isKindOfClass:[OpaqueView class]];
   if (view_1_is_opaque_view && view_2_is_opaque_view)
     return NSOrderedSame;
   if (view_1_is_opaque_view)
     return NSOrderedDescending;
@@ skipping 108 matching lines @@
                                        NSViewHeightSizable];
       [rightOpaque setAlphaValue:kAlphaValueJustOpaqueEnough];
       [rootView addSubview:rightOpaque];
     }
   }
 
   return self;
 }
 
 @end