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

gpu/command_buffer/service/in_process_command_buffer.h

 // Copyright 2013 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_IN_PROCESS_COMMAND_BUFFER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_IN_PROCESS_COMMAND_BUFFER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 109 matching lines @@
   void DestroyImage(int32_t id) override;
   int32_t CreateGpuMemoryBufferImage(size_t width,
                                      size_t height,
                                      unsigned internalformat,
                                      unsigned usage) override;
   void SignalQuery(uint32_t query_id, const base::Closure& callback) override;
   void SetLock(base::Lock*) override;
   bool IsGpuChannelLost() override;
   void EnsureWorkVisible() override;
   CommandBufferNamespace GetNamespaceID() const override;
-  uint64_t GetCommandBufferID() const override;
+  CommandBufferId GetCommandBufferID() const override;
   int32_t GetExtraCommandBufferData() const override;
   uint64_t GenerateFenceSyncRelease() override;
   bool IsFenceSyncRelease(uint64_t release) override;
   bool IsFenceSyncFlushed(uint64_t release) override;
   bool IsFenceSyncFlushReceived(uint64_t release) override;
   void SignalSyncToken(const SyncToken& sync_token,
                        const base::Closure& callback) override;
   bool CanWaitUnverifiedSyncToken(const SyncToken* sync_token) override;
 
   // The serializer interface to the GPU service (i.e. thread).
@@ skipping 71 matching lines @@
   void FlushOnGpuThread(int32_t put_offset, uint32_t order_num);
   void ScheduleDelayedWorkOnGpuThread();
   uint32_t CreateStreamTextureOnGpuThread(uint32_t client_texture_id);
   bool MakeCurrent();
   base::Closure WrapCallback(const base::Closure& callback);
   State GetStateFast();
   void QueueTask(const base::Closure& task) { service_->ScheduleTask(task); }
   void CheckSequencedThread();
   void FenceSyncReleaseOnGpuThread(uint64_t release);
   bool WaitFenceSyncOnGpuThread(gpu::CommandBufferNamespace namespace_id,
-                                uint64_t command_buffer_id,
+                                gpu::CommandBufferId command_buffer_id,
                                 uint64_t release);
   void SignalSyncTokenOnGpuThread(const SyncToken& sync_token,
                                   const base::Closure& callback);
   void SignalQueryOnGpuThread(unsigned query_id, const base::Closure& callback);
   void DestroyTransferBufferOnGpuThread(int32_t id);
   void CreateImageOnGpuThread(int32_t id,
                               const gfx::GpuMemoryBufferHandle& handle,
                               const gfx::Size& size,
                               gfx::BufferFormat format,
                               uint32_t internalformat,
                               uint32_t order_num,
                               uint64_t fence_sync);
   void DestroyImageOnGpuThread(int32_t id);
   void SetGetBufferOnGpuThread(int32_t shm_id, base::WaitableEvent* completion);
 
   // Callbacks:
   void OnContextLost();
   bool GetBufferChanged(int32_t transfer_buffer_id);
   void PumpCommands();
   void PerformDelayedWork();
 
-  const uint64_t command_buffer_id_;
+  const CommandBufferId command_buffer_id_;
 
   // Members accessed on the gpu thread (possibly with the exception of
   // creation):
   bool context_lost_;
   scoped_refptr<TransferBufferManagerInterface> transfer_buffer_manager_;
   scoped_ptr<GpuScheduler> gpu_scheduler_;
   scoped_ptr<gles2::GLES2Decoder> decoder_;
   scoped_refptr<gfx::GLContext> context_;
   scoped_refptr<gfx::GLSurface> surface_;
   scoped_refptr<SyncPointOrderData> sync_point_order_data_;
@@ skipping 61 matching lines @@
   SyncPointManager* sync_point_manager_;  // Non-owning.
   scoped_refptr<gpu::gles2::ShaderTranslatorCache> shader_translator_cache_;
   scoped_refptr<gpu::gles2::FramebufferCompletenessCache>
       framebuffer_completeness_cache_;
   DISALLOW_COPY_AND_ASSIGN(GpuInProcessThread);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_IN_PROCESS_COMMAND_BUFFER_H_