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

cc/layers/delegated_frame_provider_unittest.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/layers/delegated_frame_provider.h"
 #include "cc/layers/delegated_frame_resource_collection.h"
 #include "cc/layers/delegated_renderer_layer.h"
 #include "cc/output/delegated_frame_data.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "cc/resources/returned_resource.h"
@@ skipping 19 matching lines @@
                       root_damage_rect,
                       gfx::Transform());
     frame->render_pass_list.push_back(root_pass.Pass());
     return frame.Pass();
   }
 
   void AddTransferableResource(DelegatedFrameData* frame,
                                ResourceProvider::ResourceId resource_id) {
     TransferableResource resource;
     resource.id = resource_id;
-    resource.target = GL_TEXTURE_2D;
+    resource.mailbox_holder.texture_target = GL_TEXTURE_2D;
     frame->resource_list.push_back(resource);
   }
 
   void AddTextureQuad(DelegatedFrameData* frame,
                       ResourceProvider::ResourceId resource_id) {
     scoped_ptr<SharedQuadState> sqs = SharedQuadState::Create();
     scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
     float vertex_opacity[4] = {1.f, 1.f, 1.f, 1.f};
     quad->SetNew(sqs.get(),
                  gfx::Rect(0, 0, 10, 10),
@@ skipping 335 matching lines @@
 
   frame_provider_ = NULL;
 
   // Nothing is returned twice.
   EXPECT_FALSE(ReturnAndResetResourcesAvailable());
   EXPECT_EQ(0u, resources_.size());
 }
 
 }  // namespace
 }  // namespace cc