GPU process clients can perform a "shallow" finish.

content/common/gpu/client/webgraphicscontext3d_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 CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 206 matching lines @@
   virtual void disable(WGC3Denum cap);
   virtual void disableVertexAttribArray(WGC3Duint index);
   virtual void drawArrays(WGC3Denum mode, WGC3Dint first, WGC3Dsizei count);
   virtual void drawElements(WGC3Denum mode,
                             WGC3Dsizei count,
                             WGC3Denum type,
                             WGC3Dintptr offset);
 
   virtual void enable(WGC3Denum cap);
   virtual void enableVertexAttribArray(WGC3Duint index);
-  virtual void finish();
+  //virtual void finish();
   virtual void flush();
   virtual void framebufferRenderbuffer(WGC3Denum target,
                                        WGC3Denum attachment,
                                        WGC3Denum renderbuffertarget,
                                        WebGLId renderbuffer);
   virtual void framebufferTexture2D(WGC3Denum target,
                                     WGC3Denum attachment,
                                     WGC3Denum textarget,
                                     WebGLId texture,
                                     WGC3Dint level);
@@ skipping 513 matching lines @@
   bool use_echo_for_swap_ack_;
   size_t command_buffer_size_;
   size_t start_transfer_buffer_size_;
   size_t min_transfer_buffer_size_;
   size_t max_transfer_buffer_size_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_WEBGRAPHICSCONTEXT3D_COMMAND_BUFFER_IMPL_H_