Add gpu::MailboxHolder to hold state for a gpu::Mailbox

cc/test/fake_delegated_renderer_layer_impl.cc

 // Copyright 2013 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 "cc/test/fake_delegated_renderer_layer_impl.h"
 
 #include "base/bind.h"
 #include "cc/output/delegated_frame_data.h"
 #include "cc/quads/draw_quad.h"
 #include "cc/resources/returned_resource.h"
@@ skipping 12 matching lines @@
   return FakeDelegatedRendererLayerImpl::Create(
       tree_impl, id()).PassAs<LayerImpl>();
 }
 
 static ResourceProvider::ResourceId AddResourceToFrame(
     ResourceProvider* resource_provider,
     DelegatedFrameData* frame,
     ResourceProvider::ResourceId resource_id) {
   TransferableResource resource;
   resource.id = resource_id;
-  resource.target = resource_provider->TargetForTesting(resource_id);
+  resource.mailbox_holder.texture_target =
+      resource_provider->TargetForTesting(resource_id);
   frame->resource_list.push_back(resource);
   return resource_id;
 }
 
 ResourceProvider::ResourceIdSet FakeDelegatedRendererLayerImpl::Resources()
     const {
   ResourceProvider::ResourceIdSet set;
   ResourceProvider::ResourceIdArray array;
   array = ResourcesForTesting();
   for (size_t i = 0; i < array.size(); ++i)
@@ skipping 16 matching lines @@
     RenderPass* pass = delegated_frame->render_pass_list[i];
     for (size_t j = 0; j < pass->quad_list.size(); ++j)
       pass->quad_list[j]->IterateResources(add_resource_to_frame_callback);
   }
 
   CreateChildIdIfNeeded(base::Bind(&NoopReturnCallback));
   SetFrameData(delegated_frame.get(), gfx::RectF());
 }
 
 }  // namespace cc