Make sure Ppapi compositor layer resources are synchronized.

ppapi/proxy/compositor_layer_resource.cc

 // Copyright 2014 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 "ppapi/proxy/compositor_layer_resource.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "gpu/GLES2/gl2extchromium.h"
@@ skipping 160 matching lines @@
   // passed to SetSourceRect().
   source_size_ = PP_MakeFloatSize(1.0f, 1.0f);
 
   data_.common.size = *size;
   data_.common.resource_id = compositor_->GenerateResourceId();
   data_.texture->target = target;
   data_.texture->source_rect.point = PP_MakeFloatPoint(0.0f, 0.0f);
   data_.texture->source_rect.size = source_size_;
 
   const GLuint64 fence_sync = gl->InsertFenceSyncCHROMIUM();
-  gl->OrderingBarrierCHROMIUM();
-  gl->GenUnverifiedSyncTokenCHROMIUM(fence_sync,
-                                     data_.texture->sync_token.GetData());
+  gl->ShallowFlushCHROMIUM();
+  gl->GenSyncTokenCHROMIUM(fence_sync, data_.texture->sync_token.GetData());
 
   // If the PP_Resource of this layer is released by the plugin, the
   // release_callback will be aborted immediately, but the texture or image
   // in this layer may still being used by chromium compositor. So we have to
   // use ScopedPPResource to keep this resource alive until the texture or image
   // is released by the chromium compositor.
   release_callback_ = base::Bind(
       &OnTextureReleased,
       ScopedPPResource(pp_resource()), // Keep layer alive.
       ScopedPPResource(context), // Keep context alive
@@ skipping 188 matching lines @@
 
   // Do not allow using a block callback as a release callback.
   if (release_callback->is_blocking())
     return PP_ERROR_BADARGUMENT;
 
   return PP_OK;
 }
 
 }  // namespace proxy
 }  // namespace ppapi