Added a unique command buffer ID for command buffers.

mojo/gles2/command_buffer_client_impl.h

Index: mojo/gles2/command_buffer_client_impl.h
diff --git a/mojo/gles2/command_buffer_client_impl.h b/mojo/gles2/command_buffer_client_impl.h
index 62898de59b58ccefd79dd6fa832bcc4c87e7290b..04f5243fb13206a86aa0b425ba4e292e287712cd 100644
--- a/mojo/gles2/command_buffer_client_impl.h
+++ b/mojo/gles2/command_buffer_client_impl.h
@@ -72,6 +72,8 @@ class CommandBufferClientImpl : public mojo::CommandBufferLostContextObserver,
   uint32 CreateStreamTexture(uint32 texture_id) override;
   void SetLock(base::Lock*) override;
   bool IsGpuChannelLost() override;
+  gpu::CommandBufferNamespace GetNamespaceID() const override;
+  uint64_t GetCommandBufferID() const override;
 
  private:
   class SyncClientImpl;