cc: De-special-case SurfaceLayer code

content/renderer/child_frame_compositing_helper.cc

 // 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/renderer/child_frame_compositing_helper.h"
 
 #include <utility>
 
 #include "cc/blink/web_layer_impl.h"
 #include "cc/layers/picture_image_layer.h"
@@ skipping 205 matching lines @@
   float scale_factor = surface_info.device_scale_factor();
   surface_id_ = surface_info.id();
   scoped_refptr<cc::SurfaceLayer> surface_layer =
       cc::SurfaceLayer::Create(surface_reference_factory_);
   // TODO(oshima): This is a stopgap fix so that the compositor does not
   // scaledown the content when 2x frame data is added to 1x parent frame data.
   // Fix this in cc/.
   if (IsUseZoomForDSFEnabled())
     scale_factor = 1.0f;
 
-  surface_layer->SetPrimarySurfaceInfo(cc::SurfaceInfo(
-      surface_info.id(), scale_factor, surface_info.size_in_pixels()));
+  cc::SurfaceInfo modified_surface_info(surface_info.id(), scale_factor,
+                                        surface_info.size_in_pixels());
+  surface_layer->SetPrimarySurfaceInfo(modified_surface_info);
+  surface_layer->SetFallbackSurfaceInfo(modified_surface_info);
   surface_layer->SetMasksToBounds(true);
   std::unique_ptr<cc_blink::WebLayerImpl> layer(
       new cc_blink::WebLayerImpl(surface_layer));
   // TODO(lfg): Investigate if it's possible to propagate the information about
   // the child surface's opacity. https://crbug.com/629851.
   layer->SetOpaque(false);
   layer->SetContentsOpaqueIsFixed(true);
   UpdateWebLayer(std::move(layer));
 
   UpdateVisibility(true);
@@ skipping 13 matching lines @@
       surface_info.size_in_pixels(), surface_info.device_scale_factor(),
       static_cast<cc_blink::WebLayerImpl*>(web_layer_.get())->layer());
 }
 
 void ChildFrameCompositingHelper::UpdateVisibility(bool visible) {
   if (web_layer_)
     web_layer_->SetDrawsContent(visible);
 }
 
 }  // namespace content