Fix content scaling bug on Mac

content/common/gpu/image_transport_surface_calayer_mac.mm

 // Copyright 2014 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/common/gpu/image_transport_surface_calayer_mac.h"
 
 #include <OpenGL/CGLRenderers.h>
 
 #include "base/command_line.h"
 #include "base/mac/sdk_forward_declarations.h"
@@ skipping 113 matching lines @@
                GL_RGBA,
                GL_UNSIGNED_BYTE,
                NULL);
   error = glGetError();
   if (error != GL_NO_ERROR) {
     DLOG(ERROR) << "glTexImage failed with GL error: " << error;
     return false;
   }
   glFlush();
 
-  // Disable the fade-in animation as the layer is changed.
-  ScopedCAActionDisabler disabler;
-
   // Set the parameters that will be used to allocate the CALayer to draw the
   // texture into.
   share_group_context_.reset(CGLRetainContext(context));
   fbo_texture_ = texture;
   fbo_pixel_size_ = pixel_size;
   fbo_scale_factor_ = scale_factor;
   return true;
 }
 
 void CALayerStorageProvider::FreeColorBufferStorage() {
@@ skipping 173 matching lines @@
     return;
   pending_draw_weak_factory_.InvalidateWeakPtrs();
   has_pending_draw_ = false;
   transport_surface_->SendSwapBuffers(
       SurfaceHandleFromCAContextID([context_ contextId]),
       fbo_pixel_size_,
       fbo_scale_factor_);
 }
 
 }  //  namespace content