Add fence support for TransferBuffers

src/gpu/gl/GrGLDefines.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
 #ifndef GrGLDefines_DEFINED
@@ skipping 949 matching lines @@
 #define GR_GL_TEXTURE_EXTERNAL                              0x8D65
 
 /* GL_ARB_texture_rectangle */
 #define GR_GL_TEXTURE_RECTANGLE                             0x84F5
 
 /* GL_EXT_window_rectangles */
 #define GR_GL_MAX_WINDOW_RECTANGLES                         0x8f14
 #define GR_GL_INCLUSIVE                                     0x8f10
 #define GR_GL_EXCLUSIVE                                     0x8f11
 
+/* GL_ARB_sync */
+#define GR_GL_SYNC_GPU_COMMANDS_COMPLETE                    0x9117
+#define GR_GL_ALREADY_SIGNALED                              0x911A
+#define GR_GL_TIMEOUT_EXPIRED                               0x911B
+#define GR_GL_CONDITION_SATISFIED                           0x911C
+#define GR_GL_WAIT_FAILED                                   0x911D
+#define GR_GL_SYNC_FLUSH_COMMANDS_BIT                       0x00000001
+
 /* EGL Defines */
 #define GR_EGL_NO_DISPLAY                                   ((GrEGLDisplay)0)
 #define GR_EGL_EXTENSIONS                                   0x3055
 #define GR_EGL_GL_TEXTURE_2D                                0x30B1
 #define GR_EGL_GL_TEXTURE_LEVEL                             0x30BC
 #define GR_EGL_IMAGE_PRESERVED                              0x30D2
 #define GR_EGL_FALSE                                        0x0
 #define GR_EGL_TRUE                                         0x1
 #define GR_EGL_NONE                                         0x3038
 #define GR_EGL_NO_IMAGE                                    ((GrEGLImage)0)
 
 #endif