CC Animations: Enable external animation host for ui::Compositor (Aura)

ui/compositor/layer.cc

Index: ui/compositor/layer.cc
diff --git a/ui/compositor/layer.cc b/ui/compositor/layer.cc
index cfa0dc293653320c85bf1671fba99ec7abef0951..e5569d0ff63b8f515ce73594201a4667c8ddcd20 100644
--- a/ui/compositor/layer.cc
+++ b/ui/compositor/layer.cc
@@ -132,8 +132,9 @@ const cc::LayerSettings& Layer::UILayerSettings() {
 // static
 void Layer::InitializeUILayerSettings() {
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
-  if (command_line->HasSwitch(switches::kUIEnableCompositorAnimationTimelines))
-    g_ui_layer_settings.Get().use_compositor_animation_timelines = true;
+  g_ui_layer_settings.Get().use_compositor_animation_timelines =
+      !command_line->HasSwitch(
+          switches::kUIDisableCompositorAnimationTimelines);
 }
 
 const Compositor* Layer::GetCompositor() const {