Rework FlushSync to return early if commands have been processed since the last update

ppapi/proxy/ppb_context_3d_proxy.h

Index: ppapi/proxy/ppb_context_3d_proxy.h
diff --git a/ppapi/proxy/ppb_context_3d_proxy.h b/ppapi/proxy/ppb_context_3d_proxy.h
index 117dbe0651449ff7bfd7d9a380c292e53145ff62..3e2f9531d4068fb127f71c45692a489e129569bc 100644
--- a/ppapi/proxy/ppb_context_3d_proxy.h
+++ b/ppapi/proxy/ppb_context_3d_proxy.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -100,6 +100,7 @@ class PPB_Context3D_Proxy : public InterfaceProxy {
                      gpu::CommandBuffer::State* state);
   void OnMsgFlush(const HostResource& context,
                   int32 put_offset,
+                  int32 last_known_get,
                   gpu::CommandBuffer::State* state);
   void OnMsgAsyncFlush(const HostResource& context,
                        int32 put_offset);