Add flag to bench/render pictures

R=robertphillips@google.com, bsalomon@google.com

Author: krajcevski@google.com

Review URL: https://codereview.chromium.org/464423003
diff --git a/tools/CopyTilesRenderer.h b/tools/CopyTilesRenderer.h
index d7cf242..b244142 100644
--- a/tools/CopyTilesRenderer.h
+++ b/tools/CopyTilesRenderer.h
@@ -22,7 +22,11 @@
     class CopyTilesRenderer : public TiledPictureRenderer {
 
     public:
+#if SK_SUPPORT_GPU
+        CopyTilesRenderer(const GrContext::Options &opts, int x, int y);
+#else
         CopyTilesRenderer(int x, int y);
+#endif
         virtual void init(const SkPicture* pict, 
                           const SkString* writePath, 
                           const SkString* mismatchPath,