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

cc/trees/layer_tree_host_perftest.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/trees/layer_tree_host.h"
 
 #include <stdint.h>
 
 #include <sstream>
 
@@ skipping 279 matching lines @@
     if (CleanUpStarted())
       return;
     gpu::Mailbox gpu_mailbox;
     std::ostringstream name_stream;
     name_stream << "name" << next_fence_sync_;
     gpu_mailbox.SetName(
         reinterpret_cast<const int8_t*>(name_stream.str().c_str()));
     scoped_ptr<SingleReleaseCallback> callback = SingleReleaseCallback::Create(
         base::Bind(&EmptyReleaseCallback));
 
-    gpu::SyncToken next_sync_token(gpu::CommandBufferNamespace::GPU_IO, 0, 1,
+    gpu::SyncToken next_sync_token(gpu::CommandBufferNamespace::GPU_IO, 0,
+                                   gpu::CommandBufferId::FromUnsafeValue(1),
                                    next_fence_sync_);
     next_sync_token.SetVerifyFlush();
     TextureMailbox mailbox(gpu_mailbox, next_sync_token, GL_TEXTURE_2D);
     next_fence_sync_++;
 
     tab_contents_->SetTextureMailbox(mailbox, std::move(callback));
   }
 
   void DidCommit() override {
     if (CleanUpStarted())
@@ skipping 34 matching lines @@
 TEST_F(LayerTreeHostPerfTestJsonReader, HeavyPageThreaded) {
   begin_frame_driven_drawing_ = true;
   measure_commit_cost_ = true;
   SetTestName("heavy_page");
   ReadTestFile("heavy_layer_tree");
   RunTest(CompositorMode::THREADED, false);
 }
 
 }  // namespace
 }  // namespace cc