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

gpu/gles2_conform_support/egl/display.h

 // Copyright (c) 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.
 
 #ifndef GPU_GLES2_CONFORM_SUPPORT_EGL_DISPLAY_H_
 #define GPU_GLES2_CONFORM_SUPPORT_EGL_DISPLAY_H_
 
 #include <EGL/egl.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 74 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, const base::Closure& callback) override;
   void SetLock(base::Lock*) override;
   bool IsGpuChannelLost() override;
   void EnsureWorkVisible() override;
   gpu::CommandBufferNamespace GetNamespaceID() const override;
-  uint64_t GetCommandBufferID() const override;
+  gpu::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 gpu::SyncToken& sync_token,
                        const base::Closure& callback) override;
   bool CanWaitUnverifiedSyncToken(const gpu::SyncToken* sync_token) override;
 
  private:
@@ skipping 19 matching lines @@
   scoped_ptr<Config> config_;
   scoped_ptr<Surface> surface_;
   scoped_ptr<gpu::gles2::GLES2Implementation> context_;
 
   DISALLOW_COPY_AND_ASSIGN(Display);
 };
 
 }  // namespace egl
 
 #endif  // GPU_GLES2_CONFORM_SUPPORT_EGL_DISPLAY_H_