Add OrderingBarrierCHROMIUM API.

gpu/command_buffer/client/cmd_buffer_helper.h

Index: gpu/command_buffer/client/cmd_buffer_helper.h
diff --git a/gpu/command_buffer/client/cmd_buffer_helper.h b/gpu/command_buffer/client/cmd_buffer_helper.h
index 053c1c9f2a9e5e2b0cd570e5631921575546b966..07c155341c3a7ae36dc44235c1e9bba57de1d548 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper.h
+++ b/gpu/command_buffer/client/cmd_buffer_helper.h
@@ -66,6 +66,9 @@ class GPU_EXPORT CommandBufferHelper {
   // returns, the command buffer service is aware of all pending commands.
   void Flush();
 
+  // As Flush, but may be deferred in a CommandBufferProxy implementation.
+  void ShallowFlush();
+
   // Waits until all the commands have been executed. Returns whether it
   // was successful. The function will fail if the command buffer service has
   // disconnected.
@@ -322,6 +325,7 @@ class GPU_EXPORT CommandBufferHelper {
   int32 token_;
   int32 put_;
   int32 last_put_sent_;
+  int32 last_shallow_put_sent_;
 
 #if defined(CMD_HELPER_PERIODIC_FLUSH_CHECK)
   int commands_issued_;