GPU process clients can perform a "shallow" finish.

cc/resources/resource_provider.cc

 // Copyright 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.
 
 #include "cc/resources/resource_provider.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/containers/hash_tables.h"
@@ skipping 453 matching lines @@
 
   texture_uploader_->ReleaseCachedQueries();
 }
 
 void ResourceProvider::Flush() {
   DCHECK(thread_checker_.CalledOnValidThread());
   WebGraphicsContext3D* context3d = output_surface_->context3d();
   if (context3d)
     context3d->flush();
 }
-
-void ResourceProvider::Finish() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  WebGraphicsContext3D* context3d = output_surface_->context3d();
-  if (context3d)
-    context3d->finish();
-}
+//
+//void ResourceProvider::Finish() {
+//  DCHECK(thread_checker_.CalledOnValidThread());
+//  WebGraphicsContext3D* context3d = output_surface_->context3d();
+//  if (context3d)
+//    context3d->finish();
+//}
 
 bool ResourceProvider::ShallowFlushIfSupported() {
   DCHECK(thread_checker_.CalledOnValidThread());
   WebGraphicsContext3D* context3d = output_surface_->context3d();
   if (!context3d || !use_shallow_flush_)
     return false;
 
   context3d->shallowFlushCHROMIUM();
   return true;
 }
@@ skipping 917 matching lines @@
 
   WebGraphicsContext3D* context3d = output_surface_->context3d();
   DCHECK(context3d);
   int stride = 0;
   context3d->getImageParameterivCHROMIUM(
       resource->image_id, GL_IMAGE_ROWBYTES_CHROMIUM, &stride);
   return stride;
 }
 
 }  // namespace cc