Expose FS show/hide thresholds to Command Line

cc/layer_tree_host_impl.cc

Index: cc/layer_tree_host_impl.cc
diff --git a/cc/layer_tree_host_impl.cc b/cc/layer_tree_host_impl.cc
index d1e90409007a922b5268a96b5b7f4a61af1e3151..8d59c44b6448ae8a6073af59c4ddb4db9c3ac638 100644
--- a/cc/layer_tree_host_impl.cc
+++ b/cc/layer_tree_host_impl.cc
@@ -163,8 +163,12 @@ LayerTreeHostImpl::LayerTreeHostImpl(const LayerTreeSettings& settings, LayerTre
     DCHECK(m_proxy->isImplThread());
     didVisibilityChange(this, m_visible);
 
-    if (settings.calculateTopControlsPosition)
-        m_topControlsManager = TopControlsManager::Create(this, settings.topControlsHeight);
+    if (settings.calculateTopControlsPosition) {
+        m_topControlsManager = TopControlsManager::Create(this,
+                                                          settings.topControlsHeight,
+                                                          settings.topControlsShowThreshold,
+                                                          settings.topControlsHideThreshold);
+    }
 
     // LTHI always has an active tree.
     m_activeTree = LayerTreeImpl::create(this);