Add rTree factory to beginRecording call in RasterBufferImpl ctor

cc/resources/gpu_rasterizer.cc

Index: cc/resources/gpu_rasterizer.cc
diff --git a/cc/resources/gpu_rasterizer.cc b/cc/resources/gpu_rasterizer.cc
index e3d165dcb53e187567e7eb009002f16d0fd4c26a..fe1025c11494638796ed59056395cfa3fe8ea2ee 100644
--- a/cc/resources/gpu_rasterizer.cc
+++ b/cc/resources/gpu_rasterizer.cc
@@ -128,11 +128,12 @@ void GpuRasterizer::AddToMultiPictureDraw(const Tile* tile,
   if (!sk_surface)
     return;
 
+  SkRTreeFactory factory;
   SkPictureRecorder recorder;
   gfx::Size size = resource->size();
   const int flags = SkPictureRecorder::kComputeSaveLayerInfo_RecordFlag;
   skia::RefPtr<SkCanvas> canvas = skia::SharePtr(
-      recorder.beginRecording(size.width(), size.height(), NULL, flags));
+      recorder.beginRecording(size.width(), size.height(), &factory, flags));
 
   canvas->save();
   tile->raster_source()->PlaybackToCanvas(canvas.get(), tile->content_rect(),