cc: Add checker-imaging support to TileManager.

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 481a3703d9e63c09cd252979ccff3c663ad3231f..f2c1267c6633fc5f98407173de51c3d4d2b08849 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -318,6 +318,14 @@ void LayerTreeImpl::BuildLayerListForTesting() {
   }
 }
 
+void LayerTreeImpl::InvalidateRegionForImages(
+    const std::unordered_set<uint32_t>& images_to_invalidate) {
+  DCHECK(IsSyncTree());
+  for (auto* picture_layer : picture_layers_) {
+    picture_layer->InvalidateRegionForImages(images_to_invalidate);
+  }
+}
+
 bool LayerTreeImpl::IsRootLayer(const LayerImpl* layer) const {
   return layer_list_.empty() ? false : layer_list_[0] == layer;
 }