Make RenderPass::Id an isolated class

mojo/services/public/cpp/surfaces/tests/surface_unittest.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/quads/render_pass.h"
 #include "cc/quads/solid_color_draw_quad.h"
 #include "cc/quads/surface_draw_quad.h"
 #include "cc/quads/texture_draw_quad.h"
 #include "gpu/command_buffer/common/mailbox.h"
 #include "gpu/command_buffer/common/mailbox_holder.h"
@@ skipping 185 matching lines @@
   EXPECT_EQ(Size::From(content_bounds), mojo_sqs->content_bounds);
   EXPECT_EQ(Rect::From(visible_content_rect), mojo_sqs->visible_content_rect);
   EXPECT_EQ(Rect::From(clip_rect), mojo_sqs->clip_rect);
   EXPECT_EQ(is_clipped, mojo_sqs->is_clipped);
   EXPECT_EQ(opacity, mojo_sqs->opacity);
   EXPECT_EQ(sorting_context_id, mojo_sqs->sorting_context_id);
 }
 
 TEST(SurfaceLibTest, RenderPass) {
   scoped_ptr<cc::RenderPass> pass = cc::RenderPass::Create();
-  cc::RenderPass::Id pass_id(1, 6);
+  cc::RenderPassId pass_id(1, 6);
   gfx::Rect output_rect(4, 9, 13, 71);
   gfx::Rect damage_rect(9, 17, 41, 45);
   gfx::Transform transform_to_root_target;
   transform_to_root_target.SkewY(43.0);
   bool has_transparent_background = false;
   pass->SetAll(pass_id,
                output_rect,
                damage_rect,
                transform_to_root_target,
                has_transparent_background);
@@ skipping 232 matching lines @@
   cc::ReturnedResource round_trip_resource =
       mojo_resource.To<cc::ReturnedResource>();
   EXPECT_EQ(id, round_trip_resource.id);
   EXPECT_EQ(sync_point, round_trip_resource.sync_point);
   EXPECT_EQ(count, round_trip_resource.count);
   EXPECT_EQ(lost, round_trip_resource.lost);
 }
 
 }  // namespace
 }  // namespace mojo