mus: Adds WindowManagerDelegate::OnWmConnected()

ui/aura/mus/window_tree_client.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/mus/window_tree_client.h"
 
 #include <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 1404 matching lines @@
 
   bool valid_wait = true;
   // TODO(sky): having to block here is not ideal. http://crbug.com/594852.
   while (!got_initial_displays_ && valid_wait)
     valid_wait = binding_.WaitForIncomingMethodCall();
   return valid_wait;
 }
 
 void WindowTreeClient::OnConnect(ClientSpecificId client_id) {
   client_id_ = client_id;
+  if (window_manager_delegate_)
+    window_manager_delegate_->OnWmConnected();
 }
 
 void WindowTreeClient::WmNewDisplayAdded(
     const display::Display& display,
     ui::mojom::WindowDataPtr root_data,
     bool parent_drawn,
     const cc::FrameSinkId& frame_sink_id,
     const base::Optional<cc::LocalSurfaceId>& local_surface_id) {
   WmNewDisplayAddedImpl(display, std::move(root_data), parent_drawn,
                         frame_sink_id, local_surface_id);
@@ skipping 528 matching lines @@
   return ScheduleInFlightChange(base::MakeUnique<InFlightCaptureChange>(
       this, capture_synchronizer_.get(), window));
 }
 
 uint32_t WindowTreeClient::CreateChangeIdForFocus(WindowMus* window) {
   return ScheduleInFlightChange(base::MakeUnique<InFlightFocusChange>(
       this, focus_synchronizer_.get(), window));
 }
 
 }  // namespace aura