cc : Fix hit testing bug in resourceless software draw mode

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index b65b538ee72219b4a7ca48b2b0ef1fbfa42d7f0a..90a709c0d80f5404e822867bcb95ee7131ce17d3 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -212,6 +212,10 @@ class CC_EXPORT LayerTreeHostImpl
 
   void UpdateViewportContainerSizes();
 
+  void set_resourceless_software_draw_for_testing() {
+    resourceless_software_draw_ = true;
+  }
+
   struct CC_EXPORT FrameData : public RenderPassSink {
     FrameData();
     ~FrameData() override;