mash: Make system tray bubble close when another window is activated

components/mus/ws/focus_controller.cc

 // Copyright 2015 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 "components/mus/ws/focus_controller.h"
 
 #include "base/macros.h"
 #include "components/mus/public/interfaces/window_manager.mojom.h"
 #include "components/mus/ws/focus_controller_delegate.h"
 #include "components/mus/ws/focus_controller_observer.h"
@@ skipping 57 matching lines @@
   DCHECK(root_);
 }
 
 FocusController::~FocusController() {
 }
 
 void FocusController::SetFocusedWindow(ServerWindow* window) {
   if (GetFocusedWindow() == window)
     return;
 
+  // TODO(jamescook): Failures to set focus should be propagated back to the
+  // client so it doesn't get out of sync. http://crbug.com/600869
   SetFocusedWindowImpl(FocusControllerChangeSource::EXPLICIT, window);
 }
 
 ServerWindow* FocusController::GetFocusedWindow() {
   return focused_window_;
 }
 
 void FocusController::ActivateNextWindow() {
   WindowTreeIterator iter(root_);
   ServerWindow* activate = active_window_;
@@ skipping 212 matching lines @@
 }
 
 void FocusController::OnDrawnStateChanged(ServerWindow* ancestor,
                                           ServerWindow* window,
                                           bool is_drawn) {
   // DCHECK(false);  TODO(sadrul):
 }
 
 }  // namespace ws
 }  // namespace mus