Add fence support for TransferBuffers

src/gpu/gl/GrGLTestInterface.cpp

Index: src/gpu/gl/GrGLTestInterface.cpp
diff --git a/src/gpu/gl/GrGLTestInterface.cpp b/src/gpu/gl/GrGLTestInterface.cpp
index 10968a784e832f0afa3aa2fbb81775f0ec287bde..d871ef6285d74a5c98e6dbe17c2a4358f9a78aaf 100644
--- a/src/gpu/gl/GrGLTestInterface.cpp
+++ b/src/gpu/gl/GrGLTestInterface.cpp
@@ -312,6 +312,9 @@ GrGLTestInterface::GrGLTestInterface() {
     fFunctions.fMapNamedBufferRange = bind_to_member(this, &GrGLTestInterface::mapNamedBufferRange);
     fFunctions.fFlushMappedNamedBufferRange = bind_to_member(this, &GrGLTestInterface::flushMappedNamedBufferRange);
     fFunctions.fTextureBuffer = bind_to_member(this, &GrGLTestInterface::textureBuffer);
+    fFunctions.fFenceSync = bind_to_member(this, &GrGLTestInterface::fenceSync);
+    fFunctions.fClientWaitSync = bind_to_member(this, &GrGLTestInterface::clientWaitSync);
+    fFunctions.fDeleteSync = bind_to_member(this, &GrGLTestInterface::deleteSync);
     fFunctions.fDebugMessageControl = bind_to_member(this, &GrGLTestInterface::debugMessageControl);
     fFunctions.fDebugMessageInsert = bind_to_member(this, &GrGLTestInterface::debugMessageInsert);
     fFunctions.fDebugMessageCallback = bind_to_member(this, &GrGLTestInterface::debugMessageCallback);