Make RenderPass::Id an isolated class

cc/layers/render_surface_unittest.cc

 // Copyright 2011 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/base/scoped_ptr_vector.h"
 #include "cc/layers/append_quads_data.h"
 #include "cc/layers/layer_impl.h"
 #include "cc/layers/render_pass_sink.h"
 #include "cc/layers/render_surface_impl.h"
 #include "cc/quads/shared_quad_state.h"
@@ skipping 98 matching lines @@
 
   MockOcclusionTracker<LayerImpl> occlusion_tracker;
   scoped_ptr<RenderPass> render_pass = RenderPass::Create();
   AppendQuadsData append_quads_data;
 
   bool for_replica = false;
   render_surface->AppendQuads(render_pass.get(),
                               occlusion_tracker,
                               &append_quads_data,
                               for_replica,
-                              RenderPass::Id(2, 0));
+                              RenderPassId(2, 0));
 
   ASSERT_EQ(1u, render_pass->shared_quad_state_list.size());
   SharedQuadState* shared_quad_state = render_pass->shared_quad_state_list[0];
 
   EXPECT_EQ(
       30.0,
       shared_quad_state->content_to_target_transform.matrix().getDouble(0, 3));
   EXPECT_EQ(
       40.0,
       shared_quad_state->content_to_target_transform.matrix().getDouble(1, 3));
@@ skipping 39 matching lines @@
   render_surface->SetScreenSpaceTransform(origin);
   render_surface->SetContentRect(content_rect);
 
   TestRenderPassSink pass_sink;
 
   render_surface->AppendRenderPasses(&pass_sink);
 
   ASSERT_EQ(1u, pass_sink.RenderPasses().size());
   RenderPass* pass = pass_sink.RenderPasses()[0];
 
-  EXPECT_EQ(RenderPass::Id(2, 0), pass->id);
+  EXPECT_EQ(RenderPassId(2, 0), pass->id);
   EXPECT_RECT_EQ(content_rect, pass->output_rect);
   EXPECT_EQ(origin, pass->transform_to_root_target);
 }
 
 }  // namespace
 }  // namespace cc