Explicitly specify contents scale for SurfaceLayer.

content/browser/compositor/delegated_frame_host.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/browser/compositor/delegated_frame_host.h"
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
@@ skipping 389 matching lines @@
           frame_size_in_dip != current_frame_size_in_dip_) {
         if (!surface_id_.is_null())
           surface_factory_->Destroy(surface_id_);
         surface_id_ = id_allocator_->GenerateId();
         surface_factory_->Create(surface_id_, frame_size);
         // manager must outlive compositors using it.
         client_->GetLayer()->SetShowSurface(
             surface_id_,
             base::Bind(&SatisfyCallback, base::Unretained(manager)),
             base::Bind(&RequireCallback, base::Unretained(manager)), frame_size,
-            frame_size_in_dip);
+            frame_device_scale_factor, frame_size_in_dip);
         current_surface_size_ = frame_size;
+        current_scale_factor_ = frame_device_scale_factor;
       }
       scoped_ptr<cc::CompositorFrame> compositor_frame =
           make_scoped_ptr(new cc::CompositorFrame());
       compositor_frame->delegated_frame_data = frame_data.Pass();
 
       compositor_frame->metadata.latency_info.swap(skipped_latency_info_list_);
       compositor_frame->metadata.latency_info.insert(
           compositor_frame->metadata.latency_info.end(),
           latency_info.begin(),
           latency_info.end());
@@ skipping 585 matching lines @@
   if (frame_provider_.get()) {
     new_layer->SetShowDelegatedContent(frame_provider_.get(),
                                        current_frame_size_in_dip_);
   }
   if (!surface_id_.is_null()) {
     ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
     cc::SurfaceManager* manager = factory->GetSurfaceManager();
     new_layer->SetShowSurface(
         surface_id_, base::Bind(&SatisfyCallback, base::Unretained(manager)),
         base::Bind(&RequireCallback, base::Unretained(manager)),
-        current_surface_size_, current_frame_size_in_dip_);
+        current_surface_size_, current_scale_factor_,
+        current_frame_size_in_dip_);
   }
 }
 
 }  // namespace content