Hide location bar on Javascript-initiated scroll.

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index cca8c6763635e27f3436e6cb8c854c591eb5b9e2..5ad2cbedc00b524f54e7c0a93ce3f52ba5297c56 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -1050,6 +1050,15 @@ void LayerTreeHost::UpdateTopControlsState(bool enable_hiding,
                  animate));
 }
 
+void LayerTreeHost::ShowTopControls(bool show) {
+  if (!settings_.calculate_top_controls_position)
+    return;
+
+  proxy_->ImplThread()->PostTask(
+      base::Bind(&TopControlsManager::ShowTopControls,
+                 top_controls_manager_weak_ptr_, show));
+}
+
 bool LayerTreeHost::BlocksPendingCommit() const {
   if (!root_layer_)
     return false;