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 c7b177fd2865517c1893237bc779ecb0b25a16a3..f67d934ef9e79ae442bde7a0d4cb128d15b28b26 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -286,6 +286,11 @@ 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_; }