Make RenderPass::Id an isolated class

cc/trees/layer_tree_host_unittest_copyrequest.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/output/copy_output_request.h"
 #include "cc/output/copy_output_result.h"
 #include "cc/test/fake_content_layer.h"
 #include "cc/test/fake_content_layer_client.h"
 #include "cc/test/fake_output_surface.h"
 #include "cc/test/layer_tree_test.h"
@@ skipping 370 matching lines @@
     Renderer* renderer = host_impl->renderer();
 
     LayerImpl* root = host_impl->active_tree()->root_layer();
     LayerImpl* grand_parent = root->children()[0];
     LayerImpl* parent = grand_parent->children()[0];
     LayerImpl* copy_layer = parent->children()[0];
 
     // |parent| owns a surface, but it was hidden and not part of the copy
     // request so it should not allocate any resource.
     EXPECT_FALSE(renderer->HasAllocatedResourcesForTesting(
-        parent->render_surface()->RenderPassId()));
+        parent->render_surface()->GetRenderPassId()));
 
     // |copy_layer| should have been rendered to a texture since it was needed
     // for a copy request.
     EXPECT_TRUE(renderer->HasAllocatedResourcesForTesting(
-        copy_layer->render_surface()->RenderPassId()));
+        copy_layer->render_surface()->GetRenderPassId()));
 
     did_draw_ = true;
   }
 
   virtual void AfterTest() OVERRIDE { EXPECT_TRUE(did_draw_); }
 
   FakeContentLayerClient client_;
   bool did_draw_;
   scoped_refptr<FakeContentLayer> root_;
   scoped_refptr<FakeContentLayer> grand_parent_layer_;
@@ skipping 558 matching lines @@
   FakeContentLayerClient client_;
   scoped_refptr<FakeContentLayer> root_;
   scoped_refptr<FakeContentLayer> copy_layer_;
 };
 
 SINGLE_AND_MULTI_THREAD_DIRECT_RENDERER_TEST_F(
     LayerTreeHostCopyRequestTestShutdownBeforeCopy);
 
 }  // namespace
 }  // namespace cc