fix up GrImmediateDrawTarget.cpp

src/gpu/GrImmediateDrawTarget.h

Index: src/gpu/GrImmediateDrawTarget.h
diff --git a/src/gpu/GrImmediateDrawTarget.h b/src/gpu/GrImmediateDrawTarget.h
index 0110aa4564545cb40f61a09e8ebaf9500e084460..c7f4163739207f919ef40da9dd462bf3f45412ef 100644
--- a/src/gpu/GrImmediateDrawTarget.h
+++ b/src/gpu/GrImmediateDrawTarget.h
@@ -67,6 +67,10 @@ private:
                  GrColor color,
                  bool canIgnoreRect,
                  GrRenderTarget* renderTarget) override;
+    void onCopySurface(GrSurface* dst,
+                       GrSurface* src,
+                       const SkIRect& srcRect,
+                       const SkIPoint& dstPoint) override;
 
     bool isIssued(uint32_t drawID) override { return drawID != fDrawID; }