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

ui/compositor/test/test_suite.cc

Index: ui/compositor/test/test_suite.cc
diff --git a/ui/compositor/test/test_suite.cc b/ui/compositor/test/test_suite.cc
index 3b236c9623e324b443476a06402fa11e4e286dd4..1c246d227ce754f4bb2abb9c4d6d990bfb5d37b1 100644
--- a/ui/compositor/test/test_suite.cc
+++ b/ui/compositor/test/test_suite.cc
@@ -8,6 +8,7 @@
 #include "base/message_loop/message_loop.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/compositor_switches.h"
+#include "ui/compositor/layer.h"
 #include "ui/gfx/gfx_paths.h"
 #include "ui/gl/test/gl_surface_test_support.h"
 
@@ -33,6 +34,8 @@ void CompositorTestSuite::Initialize() {
   gfx::SetDefaultDeviceScaleFactor(1.0f);
 #endif
 
+  ui::Layer::InitializeUILayerSettings();
+
   message_loop_.reset(new base::MessageLoopForUI);
 }