Adds View::visible() and IsDrawn

mojo/services/public/cpp/view_manager/lib/view_private.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 MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_LIB_VIEW_PRIVATE_H_
 #define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_LIB_VIEW_PRIVATE_H_
 
 #include "base/basictypes.h"
 
 #include "mojo/services/public/cpp/view_manager/view.h"
 
 namespace mojo {
 
+// This class is a friend of a View and contains functions to mutate internal
+// state of View.
 class ViewPrivate {
  public:
   explicit ViewPrivate(View* view);
   ~ViewPrivate();
 
+  // Creates and returns a new View. Caller owns the return value.
   static View* LocalCreate();
 
   ObserverList<ViewObserver>* observers() { return &view_->observers_; }
 
   void ClearParent() { view_->parent_ = NULL; }
 
+  void set_visible(bool visible) { view_->visible_ = visible; }
+
+  void set_drawn(bool drawn) { view_->drawn_ = drawn; }
+
   void set_id(Id id) { view_->id_ = id; }
 
   ViewManager* view_manager() { return view_->manager_; }
   void set_view_manager(ViewManager* manager) {
     view_->manager_ = manager;
   }
 
   void LocalDestroy() {
     view_->LocalDestroy();
   }
   void LocalAddChild(View* child) {
     view_->LocalAddChild(child);
   }
   void LocalRemoveChild(View* child) {
     view_->LocalRemoveChild(child);
   }
   void LocalReorder(View* relative, OrderDirection direction) {
     view_->LocalReorder(relative, direction);
   }
   void LocalSetBounds(const gfx::Rect& old_bounds,
                       const gfx::Rect& new_bounds) {
     view_->LocalSetBounds(old_bounds, new_bounds);
   }
+  void LocalSetDrawn(bool drawn) { view_->LocalSetDrawn(drawn); }
 
  private:
   View* view_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewPrivate);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_LIB_VIEW_PRIVATE_H_