Introducing gpu::CommandBufferId as a distinct, IdType<...>-based type.

cc/output/gl_renderer_unittest.cc

 // Copyright 2012 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/gl_renderer.h"
 
 #include <stdint.h>
 
 #include <set>
 
@@ skipping 2167 matching lines @@
       new SingleOverlayOnTopProcessor(output_surface.get());
   processor->Initialize();
   renderer.SetOverlayProcessor(processor);
 
   gfx::Rect viewport_rect(1, 1);
   RenderPass* root_pass =
       AddRenderPass(&render_passes_in_draw_order_, RenderPassId(1, 0),
                     viewport_rect, gfx::Transform());
   root_pass->has_transparent_background = false;
 
-  gpu::SyncToken sync_token(gpu::CommandBufferNamespace::GPU_IO, 0, 0x123, 29);
+  gpu::SyncToken sync_token(gpu::CommandBufferNamespace::GPU_IO, 0,
+                            gpu::CommandBufferId::FromUnsafeValue(0x123), 29);
   TextureMailbox mailbox =
       TextureMailbox(gpu::Mailbox::Generate(), sync_token, GL_TEXTURE_2D,
                      gfx::Size(256, 256), true);
   scoped_ptr<SingleReleaseCallbackImpl> release_callback =
       SingleReleaseCallbackImpl::Create(base::Bind(&MailboxReleased));
   ResourceId resource_id = resource_provider->CreateResourceFromTextureMailbox(
       mailbox, std::move(release_callback));
   bool premultiplied_alpha = false;
   bool flipped = false;
   bool nearest_neighbor = false;
@@ skipping 17 matching lines @@
   EXPECT_CALL(overlay_scheduler,
               Schedule(1, gfx::OVERLAY_TRANSFORM_NONE, _, viewport_rect,
                        BoundingRect(uv_top_left, uv_bottom_right))).Times(1);
 
   renderer.DrawFrame(&render_passes_in_draw_order_, 1.f, viewport_rect,
                      viewport_rect, false);
 }
 
 }  // namespace
 }  // namespace cc