gpu: Add a new extension CHROMIUM_deschedule.

gpu/command_buffer/service/in_process_command_buffer.h

Index: gpu/command_buffer/service/in_process_command_buffer.h
diff --git a/gpu/command_buffer/service/in_process_command_buffer.h b/gpu/command_buffer/service/in_process_command_buffer.h
index f8d1c9cf387be75545291b734138e026cc6ac2d7..0a080330fb9e21ce71f5698ed20325774ce23945 100644
--- a/gpu/command_buffer/service/in_process_command_buffer.h
+++ b/gpu/command_buffer/service/in_process_command_buffer.h
@@ -213,6 +213,8 @@ class GPU_EXPORT InProcessCommandBuffer : public CommandBuffer,
   bool WaitFenceSyncOnGpuThread(gpu::CommandBufferNamespace namespace_id,
                                 gpu::CommandBufferId command_buffer_id,
                                 uint64_t release);
+  void DescheduleUntilFinishedOnGpuThread();
+  void RescheduleAfterFinishedOnGpuThread();
   void SignalSyncTokenOnGpuThread(const SyncToken& sync_token,
                                   const base::Closure& callback);
   void SignalQueryOnGpuThread(unsigned query_id, const base::Closure& callback);