Fixes to WindowTreeHostMus

ui/aura/mus/window_port_mus.h

Index: ui/aura/mus/window_port_mus.h
diff --git a/ui/aura/mus/window_port_mus.h b/ui/aura/mus/window_port_mus.h
index 1f7a1aa24e4ff8c1c89267fad34b2097ae205cfa..b70bd0d3e26f13862ec8dcf6e4f8b107d8edae9c 100644
--- a/ui/aura/mus/window_port_mus.h
+++ b/ui/aura/mus/window_port_mus.h
@@ -137,6 +137,13 @@ class AURA_EXPORT WindowPortMus : public WindowPort, public WindowMus {
     DISALLOW_COPY_AND_ASSIGN(ScopedServerChange);
   };
 
+  struct WindowMusChangeDataImpl : public WindowMusChangeData {
+    WindowMusChangeDataImpl();
+    ~WindowMusChangeDataImpl() override;
+
+    std::unique_ptr<ScopedServerChange> change;
+  };
+
   // Creates and adds a ServerChange to |server_changes_|. Returns the id
   // assigned to the ServerChange.
   ServerChangeIdType ScheduleChange(const ServerChangeType type,
@@ -168,6 +175,10 @@ class AURA_EXPORT WindowPortMus : public WindowPort, public WindowMus {
       const std::vector<uint8_t>* property_data) override;
   void SetSurfaceIdFromServer(
       std::unique_ptr<SurfaceInfo> surface_info) override;
+  std::unique_ptr<WindowMusChangeData> PrepareForServerBoundsChange(
+      const gfx::Rect& bounds) override;
+  std::unique_ptr<WindowMusChangeData> PrepareForServerVisibilityChange(
+      bool value) override;
   void NotifyEmbeddedAppDisconnected() override;
 
   // WindowPort: