cc: Let skia veto gpu rasterization.

cc/resources/picture_pile.h

Index: cc/resources/picture_pile.h
diff --git a/cc/resources/picture_pile.h b/cc/resources/picture_pile.h
index 804a67979e5787128540a0d837b80ac3f39ce68f..dbc3966b88ab7caecc2bd24e044884b591f8a703 100644
--- a/cc/resources/picture_pile.h
+++ b/cc/resources/picture_pile.h
@@ -37,12 +37,21 @@ class CC_EXPORT PicturePile : public PicturePileBase {
     show_debug_picture_borders_ = show;
   }
 
+  bool is_suitable_for_gpu_rasterization() const {
+    return is_suitable_for_gpu_rasterization_;
+  }
+  void SetUnsuitableForGpuRasterizationForTesting() {
+    is_suitable_for_gpu_rasterization_ = false;
+  }
+
  protected:
   virtual ~PicturePile();
 
  private:
   friend class PicturePileImpl;
 
+  bool is_suitable_for_gpu_rasterization_;
+
   DISALLOW_COPY_AND_ASSIGN(PicturePile);
 };