mus: Implement Window Server Capture

components/mus/public/cpp/view_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_VIEW_OBSERVER_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_VIEW_OBSERVER_H_
 
 #include <vector>
 
 #include "components/mus/public/cpp/view.h"
@@ skipping 35 matching lines @@
 
   virtual void OnViewDestroying(View* view) {}
   virtual void OnViewDestroyed(View* view) {}
 
   virtual void OnViewBoundsChanging(View* view,
                                     const mojo::Rect& old_bounds,
                                     const mojo::Rect& new_bounds) {}
   virtual void OnViewBoundsChanged(View* view,
                                    const mojo::Rect& old_bounds,
                                    const mojo::Rect& new_bounds) {}
+  virtual void OnViewLostCapture(View* view) {}
 
   virtual void OnViewViewportMetricsChanged(
       View* view,
       const mojo::ViewportMetrics& old_metrics,
       const mojo::ViewportMetrics& new_metrics) {}
 
   virtual void OnViewFocusChanged(View* gained_focus, View* lost_focus) {}
 
   virtual void OnViewInputEvent(View* view, const mojo::EventPtr& event) {}
 
@@ skipping 27 matching lines @@
   virtual void OnViewDrawnChanging(View* view) {}
   virtual void OnViewDrawnChanged(View* view) {}
 
  protected:
   virtual ~ViewObserver() {}
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_VIEW_OBSERVER_H_