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

content/common/gpu/gpu_command_buffer_stub.h

Index: content/common/gpu/gpu_command_buffer_stub.h
diff --git a/content/common/gpu/gpu_command_buffer_stub.h b/content/common/gpu/gpu_command_buffer_stub.h
index a74ab64c384f54cb6f141bd0157298acbf8acfee..0a3fdbae26a7bc577c08a3498e6d3d29995a4093 100644
--- a/content/common/gpu/gpu_command_buffer_stub.h
+++ b/content/common/gpu/gpu_command_buffer_stub.h
@@ -18,6 +18,7 @@
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/gpu_memory_manager.h"
+#include "gpu/command_buffer/common/command_buffer_id.h"
 #include "gpu/command_buffer/common/constants.h"
 #include "gpu/command_buffer/common/gpu_memory_allocation.h"
 #include "gpu/command_buffer/service/command_buffer_service.h"
@@ -115,7 +116,7 @@ class GpuCommandBufferStub
   GpuChannel* channel() const { return channel_; }
 
   // Unique command buffer ID for this command buffer stub.
-  uint64_t command_buffer_id() const { return command_buffer_id_; }
+  gpu::CommandBufferId command_buffer_id() const { return command_buffer_id_; }
 
   // Identifies the various GpuCommandBufferStubs in the GPU process belonging
   // to the same renderer process.
@@ -199,10 +200,10 @@ class GpuCommandBufferStub
 
   void OnFenceSyncRelease(uint64_t release);
   bool OnWaitFenceSync(gpu::CommandBufferNamespace namespace_id,
-                       uint64_t command_buffer_id,
+                       gpu::CommandBufferId command_buffer_id,
                        uint64_t release);
   void OnWaitFenceSyncCompleted(gpu::CommandBufferNamespace namespace_id,
-                                uint64_t command_buffer_id,
+                                gpu::CommandBufferId command_buffer_id,
                                 uint64_t release);
 
   void OnCreateImage(const GpuCommandBufferMsg_CreateImage_Params& params);
@@ -233,7 +234,7 @@ class GpuCommandBufferStub
   bool CheckContextLost();
   void CheckCompleteWaits();
   void PullTextureUpdates(gpu::CommandBufferNamespace namespace_id,
-                          uint64_t command_buffer_id,
+                          gpu::CommandBufferId command_buffer_id,
                           uint32_t release);
 
   // The lifetime of objects of this class is managed by a GpuChannel. The
@@ -257,7 +258,7 @@ class GpuCommandBufferStub
   std::vector<int32_t> requested_attribs_;
   gfx::GpuPreference gpu_preference_;
   bool use_virtualized_gl_context_;
-  const uint64_t command_buffer_id_;
+  const gpu::CommandBufferId command_buffer_id_;
   const int32_t stream_id_;
   const int32_t route_id_;
   const bool offscreen_;