Making WTH::InitCompositor() protected instead of public.

ash/mus/window_manager.cc

Index: ash/mus/window_manager.cc
diff --git a/ash/mus/window_manager.cc b/ash/mus/window_manager.cc
index d65aad95cc2956f4483abc724410dff025e79d4c..00cca73a9b97f1b61bf354d578636c269a182010 100644
--- a/ash/mus/window_manager.cc
+++ b/ash/mus/window_manager.cc
@@ -212,7 +212,7 @@ display::mojom::DisplayController* WindowManager::GetDisplayController() {
 RootWindowController* WindowManager::CreateRootWindowController(
     std::unique_ptr<aura::WindowTreeHostMus> window_tree_host,
     const display::Display& display) {
-  window_tree_host->InitCompositor();
+  window_tree_host->InitHost();

[sky, 2016/12/06 17:58:02]

Should we do this in WindowTreeClient::OnWmNewDisplay before it calls to the
delegate?

[mfomitchev, 2016/12/06 18:01:18]

Ok, yeah, that would make sense. I'll do it in
https://codereview.chromium.org/2552003002/ then, since that would fix some of
the tests.

   // TODO(sky): this is temporary, should use RootWindowController directly.
   aura::client::SetCaptureClient(window_tree_host->window(),
                                  wm_state_->capture_controller());