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 1c29b6f6c1aed27c65ea8c399ae1ee8c8998167f..c5e132c1ab0ef3d65be841acfb613f386aff2f1f 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -210,6 +210,10 @@ 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;