Aura-Mus: Allocate a LocalSurfaceId on size change

ui/aura/mus/window_mus.h

 // 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.
 
 #ifndef UI_AURA_MUS_WINDOW_MUS_H_
 #define UI_AURA_MUS_WINDOW_MUS_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 58 matching lines @@
 
   // These functions are called in response to a change from the server. The
   // expectation is that in calling these WindowTreeClient is not called
   // back. For example, SetBoundsFromServer() should not result in calling back
   // to WindowTreeClient::OnWindowMusBoundsChanged().
   virtual void AddChildFromServer(WindowMus* window) = 0;
   virtual void RemoveChildFromServer(WindowMus* child) = 0;
   virtual void ReorderFromServer(WindowMus* child,
                                  WindowMus* relative,
                                  ui::mojom::OrderDirection) = 0;
-  virtual void SetBoundsFromServer(const gfx::Rect& bounds) = 0;
+  virtual void SetBoundsFromServer(
+      const gfx::Rect& bounds,
+      const base::Optional<cc::LocalSurfaceId>& local_surface_id) = 0;
   virtual void SetVisibleFromServer(bool visible) = 0;
   virtual void SetOpacityFromServer(float opacity) = 0;
   virtual void SetPredefinedCursorFromServer(ui::mojom::CursorType cursor) = 0;
   virtual void SetPropertyFromServer(const std::string& property_name,
                                      const std::vector<uint8_t>* data) = 0;
   virtual void SetFrameSinkIdFromServer(
       const cc::FrameSinkId& frame_sink_id) = 0;
+  virtual const cc::LocalSurfaceId& GetOrAllocateLocalSurfaceId(
+      const gfx::Size& new_size) = 0;
   virtual void SetSurfaceInfoFromServer(
       const cc::SurfaceInfo& surface_info) = 0;
   // The window was deleted on the server side. DestroyFromServer() should
   // result in deleting |this|.
   virtual void DestroyFromServer() = 0;
   virtual void AddTransientChildFromServer(WindowMus* child) = 0;
   virtual void RemoveTransientChildFromServer(WindowMus* child) = 0;
   // Called when a window was added/removed as a transient child.
   virtual ChangeSource OnTransientChildAdded(WindowMus* child) = 0;
   virtual ChangeSource OnTransientChildRemoved(WindowMus* child) = 0;
 
+  // Returns the currently used cc::LocalSurfaceId to embed this Window. Local
+  // windows or windows that have not been embedded yet will have an invalid
+  // cc::LocalSurfaceId.
+  virtual const cc::LocalSurfaceId& GetLocalSurfaceId() = 0;
+
   // Called in the rare case when WindowTreeClient needs to change state and
   // can't go through one of the SetFooFromServer() functions above. Generally
   // because it needs to call another function that as a side effect changes the
   // window. Once the call to the underlying window has completed the returned
   // object should be destroyed.
   virtual std::unique_ptr<WindowMusChangeData> PrepareForServerBoundsChange(
       const gfx::Rect& bounds) = 0;
   virtual std::unique_ptr<WindowMusChangeData> PrepareForServerVisibilityChange(
       bool value) = 0;
 
@@ skipping 15 matching lines @@
 
   void set_server_id(Id id) { server_id_ = id; }
 
   Id server_id_ = kInvalidServerId;
   const WindowMusType window_mus_type_;
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_MUS_WINDOW_MUS_H_