Add fence support for TransferBuffers

include/gpu/gl/GrGLTypes.h

 
 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLTypes_DEFINED
 #define GrGLTypes_DEFINED
@@ skipping 40 matching lines @@
 typedef signed long long int GrGLsizeiptr;
 #else
 typedef signed long int GrGLintptr;
 typedef signed long int GrGLsizeiptr;
 #endif
 #else
 typedef signed long int GrGLintptr;
 typedef signed long int GrGLsizeiptr;
 #endif
 typedef void* GrGLeglImage;
+typedef void* GrGLsync;
 
 struct GrGLDrawArraysIndirectCommand {
     GrGLuint fCount;
     GrGLuint fInstanceCount;
     GrGLuint fFirst;
     GrGLuint fBaseInstance;  // Requires EXT_base_instance on ES.
 };
 
 GR_STATIC_ASSERT(16 == sizeof(GrGLDrawArraysIndirectCommand));
 
@@ skipping 36 matching lines @@
  */
 
 struct GrGLTextureInfo {
     GrGLenum fTarget;
     GrGLuint fID;
 };
 
 GR_STATIC_ASSERT(sizeof(GrBackendObject) >= sizeof(const GrGLTextureInfo*));
 
 #endif