Make RenderPass::Id an isolated class

cc/surfaces/surface_aggregator_test_helpers.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 "cc/surfaces/surface_aggregator_test_helpers.h"
 
 #include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
 #include "cc/layers/append_quads_data.h"
 #include "cc/output/compositor_frame.h"
@@ skipping 33 matching lines @@
                             0);
 
   SurfaceDrawQuad* surface_quad =
       pass->CreateAndAppendDrawQuad<SurfaceDrawQuad>();
   gfx::Rect quad_rect = gfx::Rect(surface_size);
   surface_quad->SetNew(pass->shared_quad_state_list.back(),
                        gfx::Rect(surface_size),
                        gfx::Rect(surface_size),
                        surface_id);
 }
-void AddTestRenderPassQuad(TestRenderPass* pass,
-                           RenderPass::Id render_pass_id) {
+void AddTestRenderPassQuad(TestRenderPass* pass, RenderPassId render_pass_id) {
   gfx::Rect output_rect = gfx::Rect(0, 0, 5, 5);
   SharedQuadState* shared_state = pass->CreateAndAppendSharedQuadState();
   shared_state->SetAll(gfx::Transform(),
                        output_rect.size(),
                        output_rect,
                        output_rect,
                        false,
                        1,
                        SkXfermode::kSrcOver_Mode,
                        0);
@@ skipping 73 matching lines @@
 
   for (size_t i = 0; i < passes->size(); ++i) {
     SCOPED_TRACE(base::StringPrintf("Pass number %" PRIuS, i));
     RenderPass* pass = passes->at(i);
     TestPassMatchesExpectations(expected_passes[i], pass);
   }
 }
 
 }  // namespace test
 }  // namespace cc