cc : Fix hit testing bug in resourceless software draw mode

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index 48bb194e7c267b897dff9c0ac05d3ffed8d73717..5cf8d4a58ac2d0f5ba000f625684cf2e590b4795 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -276,6 +276,11 @@ class CC_EXPORT LayerTreeImpl {
     return needs_update_draw_properties_;
   }
 
+  bool is_in_resourceless_software_draw_mode() {
+    return (layer_tree_host_impl_->GetDrawMode() ==
+            DRAW_MODE_RESOURCELESS_SOFTWARE);
+  }
+
   void set_needs_full_tree_sync(bool needs) { needs_full_tree_sync_ = needs; }
   bool needs_full_tree_sync() const { return needs_full_tree_sync_; }