Make reftests work for sky.

sky/compositor/layer_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 "sky/compositor/layer_host.h"
 
 #include "base/debug/trace_event.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/gpu/gl_context.h"
@@ skipping 24 matching lines @@
   if (state_ == kReadyForFrame)
     BeginFrameSoon();
 }
 
 void LayerHost::SetRootLayer(scoped_refptr<Layer> layer) {
   DCHECK(!root_layer_.get());
   root_layer_ = layer;
   root_layer_->set_host(this);
 }
 
+std::string LayerHost::GetPixels() {
+  return root_layer_->GetPixels();
+}
+
 void LayerHost::OnSurfaceConnectionCreated() {
   DCHECK_EQ(state_, kWaitingForSurfaceService);
   state_ = kReadyForFrame;
   if (frame_requested_)
     BeginFrameSoon();
 }
 
 void LayerHost::OnSurfaceIdAvailable(mojo::SurfaceIdPtr surface_id) {
   client_->OnSurfaceIdAvailable(surface_id.Pass());
 }
@@ skipping 95 matching lines @@
 }
 
 void LayerHost::DidCompleteFrame() {
   DCHECK_EQ(state_, kWaitingForFrameAcknowldgement);
   state_ = kReadyForFrame;
   if (frame_requested_)
     BeginFrame();
 }
 
 }  // namespace sky