exo: Allow updating cc::Surface viewport and crop state independently.

components/exo/surface.h

 // 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.
 
 #ifndef COMPONENTS_EXO_SURFACE_H_
 #define COMPONENTS_EXO_SURFACE_H_
 
 #include <list>
 #include <memory>
 #include <set>
@@ skipping 220 matching lines @@
   bool has_contents() const { return !!current_buffer_; }
 
   // This is true if the buffer contents should be put in a SurfaceLayer
   // rather than a TextureLayer.
   static bool use_surface_layer_;
 
   // This is true when Attach() has been called and new contents should take
   // effect next time Commit() is called.
   bool has_pending_contents_;
 
+  bool changed_viewport_or_crop_ = false;
+
   // The buffer that will become the content of surface when Commit() is called.
   base::WeakPtr<Buffer> pending_buffer_;
 
   cc::SurfaceManager* surface_manager_;
 
   scoped_refptr<SurfaceFactoryOwner> factory_owner_;
 
   // The Surface Id currently attached to the window.
   cc::SurfaceId surface_id_;
 
@@ skipping 81 matching lines @@
 
   // Surface observer list. Surface does not own the observers.
   base::ObserverList<SurfaceObserver, true> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(Surface);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_SURFACE_H_