Added a unique command buffer ID for command buffers.

gpu/command_buffer/service/command_buffer_service.h

Index: gpu/command_buffer/service/command_buffer_service.h
diff --git a/gpu/command_buffer/service/command_buffer_service.h b/gpu/command_buffer/service/command_buffer_service.h
index ddcfec3d36d64d6beb3625f9ee1c7038b3d68410..105c794b36cb6ab9fee7bc9e2b857932bf2714f2 100644
--- a/gpu/command_buffer/service/command_buffer_service.h
+++ b/gpu/command_buffer/service/command_buffer_service.h
@@ -15,6 +15,10 @@ class TransferBufferManagerInterface;
 
 class GPU_EXPORT CommandBufferServiceBase : public CommandBuffer {
  public:
+  CommandBufferServiceBase(CommandBufferNamespace namespace_id,
+                           uint64_t command_buffer_id)
+    : CommandBuffer(namespace_id, command_buffer_id) {}
+
   // Sets the current get offset. This can be called from any thread.
   virtual void SetGetOffset(int32 get_offset) = 0;
 
@@ -43,7 +47,8 @@ class GPU_EXPORT CommandBufferService : public CommandBufferServiceBase {
  public:
   typedef base::Callback<bool(int32)> GetBufferChangedCallback;
   explicit CommandBufferService(
-      TransferBufferManagerInterface* transfer_buffer_manager);
+      TransferBufferManagerInterface* transfer_buffer_manager,
+      CommandBufferNamespace namespace_id, uint64_t command_buffer_id);
   ~CommandBufferService() override;
 
   // CommandBuffer implementation: