Use transfer buffer for BatchAtlas texture copies

src/gpu/gl/GrGLBuffer.cpp

Index: src/gpu/gl/GrGLBuffer.cpp
diff --git a/src/gpu/gl/GrGLBuffer.cpp b/src/gpu/gl/GrGLBuffer.cpp
index 96226b91219491838026512eadd64408f16c531f..35441aa8f558f096ad4c0b69d279273760cd657a 100644
--- a/src/gpu/gl/GrGLBuffer.cpp
+++ b/src/gpu/gl/GrGLBuffer.cpp
@@ -30,6 +30,12 @@
 
 GrGLBuffer* GrGLBuffer::Create(GrGLGpu* gpu, size_t size, GrBufferType intendedType,
                                GrAccessPattern accessPattern, const void* data) {
+    if (gpu->glCaps().transferBufferType() == GrGLCaps::kNone_TransferBufferType &&
+        (kXferCpuToGpu_GrBufferType == intendedType ||
+        kXferGpuToCpu_GrBufferType == intendedType)) {
+        return nullptr;
+    }
+
     SkAutoTUnref<GrGLBuffer> buffer(new GrGLBuffer(gpu, size, intendedType, accessPattern, data));
     if (0 == buffer->bufferID()) {
         return nullptr;