Set focusibility correctly when initializing a window in mus+ash.

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 1431 matching lines @@
   if (!window) {
     window_manager_internal_client_->OnWmCreatedTopLevelWindow(
         change_id, kInvalidServerId);
     return;
   }
   embedded_windows_[requesting_client_id].insert(window);
   if (window_manager_internal_client_) {
     window_manager_internal_client_->OnWmCreatedTopLevelWindow(
         change_id, WindowMus::Get(window)->server_id());
   }
+  auto activatable_iter =

[sky, 2017/01/23 21:28:29]

The WindowManagerDelegate should be responsible for applying this, not the
windowtreeclient. To do it here means all clients want to honor the property,
some may not.

[Hadi, 2017/01/24 18:42:32]

Done. Implementation of WindowManagerDelegate::OnWmCreateTopLevelWindow() calls
into CreateAndParentTopLevelWindow(). So moved it there.

+      properties.find(ui::mojom::WindowManager::kActivatable_InitProperty);
+  if (activatable_iter != properties.end())
+    SetCanFocus(window, mojo::ConvertTo<bool>(activatable_iter->second));
 }
 
 void WindowTreeClient::WmClientJankinessChanged(ClientSpecificId client_id,
                                                 bool janky) {
   if (window_manager_delegate_) {
     auto it = embedded_windows_.find(client_id);
     CHECK(it != embedded_windows_.end());
     window_manager_delegate_->OnWmClientJankinessChanged(
         embedded_windows_[client_id], janky);
   }
@@ skipping 289 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