Enable the Sky compositor

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/message_loop/message_loop.h"
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "mojo/gpu/gl_context.h"
 #include "mojo/services/public/cpp/surfaces/surfaces_utils.h"
@@ skipping 31 matching lines @@
 }
 
 void LayerHost::ReturnResources(
     mojo::Array<mojo::ReturnedResourcePtr> resources) {
   resource_manager_.ReturnResources(resources.Pass());
 }
 
 void LayerHost::BeginFrame(base::TimeTicks frame_time,
                            base::TimeTicks deadline) {
   client_->BeginFrame(frame_time);
-  root_layer_->Display();
+
+  {
+    mojo::GaneshContext::Scope scope(&ganesh_context_);
+    ganesh_context_.gr()->resetContext();

[esprehn, 2014/11/21 17:53:19]

Why not do this inside the Display() call like before?

[abarth-chromium, 2014/11/21 17:56:52]

It doesn't really matter today because we only have one Layer.  I've tried to
set things up so that we can have more than one layer (e.g., between each child
mojo::View).  Conceptually, we should only enter Ganesh mode once and then draw
all the layers, which is why I moved this here.

+    root_layer_->Display();
+  }
+
   Upload(root_layer_.get());
 }
 
 void LayerHost::Upload(Layer* layer) {
   gfx::Size size = layer->size();
   surface_holder_.SetSize(size);
 
   mojo::FramePtr frame = mojo::Frame::New();
   frame->resources.resize(0u);
 
@@ skipping 35 matching lines @@
 
   frame->resources.push_back(resource.Pass());
   quad->texture_quad_state = texture_state.Pass();
   pass->quads.push_back(quad.Pass());
 
   frame->passes.push_back(pass.Pass());
   surface_holder_.SubmitFrame(frame.Pass());
 }
 
 }  // namespace sky