Updates shadow when active window changes

components/mus/public/cpp/window_observer.h

 // 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.
 
 #ifndef COMPONENTS_MUS_PUBLIC_CPP_WINDOW_OBSERVER_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_WINDOW_OBSERVER_H_
 
 #include <vector>
 
 #include "components/mus/public/cpp/window.h"
 #include "components/mus/public/interfaces/input_events.mojom.h"
 
 namespace mus {
 
 class Window;
 
 // A note on -ing and -ed suffixes:
 //
 // -ing methods are called before changes are applied to the local window model.
 // -ed methods are called after changes are applied to the local window model.
 //
 // If the change originated from another connection to the window manager, it's
 // possible that the change has already been applied to the service-side model
 // prior to being called, so for example in the case of OnWindowDestroying(),
-// it's
-// possible the window has already been destroyed on the service side.
+// it's possible the window has already been destroyed on the service side.
 
 class WindowObserver {
  public:
   struct TreeChangeParams {
     TreeChangeParams();
     Window* target;
     Window* old_parent;
     Window* new_parent;
     Window* receiver;
   };
@@ skipping 60 matching lines @@
   virtual void OnWindowDrawnChanging(Window* window) {}
   virtual void OnWindowDrawnChanged(Window* window) {}
 
  protected:
   virtual ~WindowObserver() {}
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_WINDOW_OBSERVER_H_