Check for xfer barriers in GrBatch, auto-issue barriers in GrGpu

src/gpu/GrTest.cpp

Index: src/gpu/GrTest.cpp
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index 518ebacc0786ae86e50c2896469614bfec8b14b0..7b6cb5ed37071fc14b7f41e691f8d35fe541d04c 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -175,11 +175,11 @@ public:
         return false;
     }
 
-    void xferBarrier(GrRenderTarget*, GrXferBarrierType) override {}
-
 private:
     void onResetContext(uint32_t resetBits) override {}
 
+    void xferBarrier(GrRenderTarget*, GrXferBarrierType) override {}
+
     GrTexture* onCreateTexture(const GrSurfaceDesc& desc, GrGpuResource::LifeCycle lifeCycle,
                                const void* srcData, size_t rowBytes) override {
         return NULL;