GPU process clients can perform a "shallow" finish.

webkit/common/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h

 // Copyright (c) 2012 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.
 
 #ifndef WEBKIT_COMMON_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_COMMAND_BUFFER_IMPL_H_
 #define WEBKIT_COMMON_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_COMMAND_BUFFER_IMPL_H_
 
 #if defined(ENABLE_GPU)
 
 #include <vector>
@@ skipping 484 matching lines @@
 
   virtual void copyTextureCHROMIUM(WGC3Denum target, WGC3Duint source_id,
                                    WGC3Duint dest_id, WGC3Dint level,
                                    WGC3Denum internal_format,
                                    WGC3Denum dest_type);
 
   virtual void bindUniformLocationCHROMIUM(WebGLId program, WGC3Dint location,
                                            const WGC3Dchar* uniform);
 
   virtual void shallowFlushCHROMIUM();
+  virtual void shallowFinishCHROMIUM();
 
   virtual void genMailboxCHROMIUM(WGC3Dbyte* mailbox);
   virtual void produceTextureCHROMIUM(WGC3Denum target,
                                       const WGC3Dbyte* mailbox);
   virtual void consumeTextureCHROMIUM(WGC3Denum target,
                                       const WGC3Dbyte* mailbox);
 
   virtual void insertEventMarkerEXT(const WGC3Dchar* marker);
   virtual void pushGroupMarkerEXT(const WGC3Dchar* marker);
   virtual void popGroupMarkerEXT();
@@ skipping 81 matching lines @@
   void FlipVertically(uint8* framebuffer,
                       unsigned int width,
                       unsigned int height);
 };
 
 }  // namespace gpu
 }  // namespace webkit
 
 #endif  // defined(ENABLE_GPU)
 #endif  // WEBKIT_COMMON_GPU_WEBGRAPHICSCONTEXT3D_IN_PROCESS_COMMAND_BUFFER_IMPL_H_