Add fence support for TransferBuffers

src/gpu/gl/GrGLInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLExtensions.h"
@@ skipping 768 matching lines @@
         fExtensions.has("GL_ARB_sample_shading")) {
         if (nullptr == fFunctions.fMinSampleShading) {
             RETURN_FALSE_INTERFACE
         }
     } else if (kGLES_GrGLStandard == fStandard && fExtensions.has("GL_OES_sample_shading")) {
         if (nullptr == fFunctions.fMinSampleShading) {
             RETURN_FALSE_INTERFACE
         }
     }
 
+    if (kGL_GrGLStandard == fStandard) {
+        if (glVer >= GR_GL_VER(3, 2) || fExtensions.has("GL_ARB_sync")) {
+            if (nullptr == fFunctions.fFenceSync ||
+                nullptr == fFunctions.fClientWaitSync ||
+                nullptr == fFunctions.fDeleteSync) {
+                RETURN_FALSE_INTERFACE
+            }
+        }
+    } else if (kGLES_GrGLStandard == fStandard) {
+        if (glVer >= GR_GL_VER(3, 0)) {
+            if (nullptr == fFunctions.fFenceSync ||
+                nullptr == fFunctions.fClientWaitSync ||
+                nullptr == fFunctions.fDeleteSync) {
+                RETURN_FALSE_INTERFACE
+            }
+        }
+    }
+
     if (fExtensions.has("EGL_KHR_image") || fExtensions.has("EGL_KHR_image_base")) {
         if (nullptr == fFunctions.fEGLCreateImage ||
             nullptr == fFunctions.fEGLDestroyImage) {
             RETURN_FALSE_INTERFACE
         }
     }
 
     if (kGL_GrGLStandard == fStandard && glVer >= GR_GL_VER(2,0)) {
         if (nullptr == fFunctions.fDrawRangeElements) {
             RETURN_FALSE_INTERFACE;
         }
     } else if (kGLES_GrGLStandard == fStandard && glVer >= GR_GL_VER(3,0)) {
         if (nullptr == fFunctions.fDrawRangeElements) {
             RETURN_FALSE_INTERFACE;
         }
     }
 
     return true;
 }