Adds TODO with reference to bug

ash/mus/bridge/wm_window_mus.cc

 // Copyright 2016 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 "ash/mus/bridge/wm_window_mus.h"
 
 #include "ash/common/wm/container_finder.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/common/wm_layout_manager.h"
 #include "ash/common/wm_transient_window_observer.h"
@@ skipping 11 matching lines @@
 #include "ui/aura/mus/mus_util.h"
 #include "ui/aura/window.h"
 #include "ui/base/hit_test.h"
 #include "ui/display/display.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 
 MUS_DECLARE_WINDOW_PROPERTY_TYPE(ash::mus::WmWindowMus*);
 
-// TODO(sky): fully implement this. Making DVLOG as too spammy to be useful.

[sky, 2016/08/24 22:51:32]

This is no longer necessary because of the defines in BUILD.gn

-#undef NOTIMPLEMENTED
-#define NOTIMPLEMENTED() DVLOG(1) << "notimplemented"
-
 namespace {
 
 MUS_DEFINE_OWNED_WINDOW_PROPERTY_KEY(ash::mus::WmWindowMus,
                                      kWmWindowKey,
                                      nullptr);
 
 }  // namespace
 
 namespace ash {
 namespace mus {
@@ skipping 665 matching lines @@
     return this;
   for (ui::Window* child : window_->children()) {
     WmWindow* result = Get(child)->GetChildByShellWindowId(id);
     if (result)
       return result;
   }
   return nullptr;
 }
 
 void WmWindowMus::ShowResizeShadow(int component) {
+  // TODO: http://crbug.com/640773.
   NOTIMPLEMENTED();
 }
 
 void WmWindowMus::HideResizeShadow() {
+  // TODO: http://crbug.com/640773.
   NOTIMPLEMENTED();
 }
 
 void WmWindowMus::InstallResizeHandleWindowTargeter(
     ImmersiveFullscreenController* immersive_fullscreen_controller) {
   // TODO(sky): I believe once ImmersiveFullscreenController is ported this
   // won't be necessary in mash, but I need to verify that:
   // http://crbug.com/548435.
 }
 
@@ skipping 137 matching lines @@
 }
 
 void WmWindowMus::OnTransientChildRemoved(ui::Window* window,
                                           ui::Window* transient) {
   FOR_EACH_OBSERVER(WmTransientWindowObserver, transient_observers_,
                     OnTransientChildRemoved(this, Get(transient)));
 }
 
 }  // namespace mus
 }  // namespace ash