Start using GrGpuCommandBuffer in GrDrawTarget.

src/gpu/batches/GrCopySurfaceBatch.h

Index: src/gpu/batches/GrCopySurfaceBatch.h
diff --git a/src/gpu/batches/GrCopySurfaceBatch.h b/src/gpu/batches/GrCopySurfaceBatch.h
index 3926643f8aedff441e2c36aece565a267c3d9ba8..d0269b79bf8c795494f551edf39d0b21e91bcd4d 100644
--- a/src/gpu/batches/GrCopySurfaceBatch.h
+++ b/src/gpu/batches/GrCopySurfaceBatch.h
@@ -36,7 +36,7 @@ public:
         GrRenderTarget* rt = fDst.get()->asRenderTarget();
         return rt ? rt->getUniqueID() : 0;
     }
-    GrRenderTarget* renderTarget() const override { return fDst.get()->asRenderTarget(); }
+    GrRenderTarget* renderTarget() const override { return nullptr; }
 
     SkString dumpInfo() const override {
         SkString string;
@@ -63,8 +63,13 @@ private:
 
     void onPrepare(GrBatchFlushState*) override {}
 
-    void onDraw(GrBatchFlushState* state) override {
-        state->gpu()->copySurface(fDst.get(), fSrc.get(), fSrcRect, fDstPoint);
+    void onDraw(GrBatchFlushState* state, GrGpuCommandBuffer* buffer) override {
+        if (!buffer) {
+            state->gpu()->copySurface(fDst.get(), fSrc.get(), fSrcRect, fDstPoint);
+        } else {
+            // currently we are not sending copies through the GrGpuCommandBuffer
+            SkASSERT(false);
+        }
     }
 
     GrPendingIOResource<GrSurface, kWrite_GrIOType> fDst;