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diff --git a/chromium/ui/wm/core/visibility_controller.h b/chromium/ui/wm/core/visibility_controller.h
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+++ b/chromium/ui/wm/core/visibility_controller.h
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+// Copyright (c) 2012 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_WM_CORE_VISIBILITY_CONTROLLER_H_
+#define UI_WM_CORE_VISIBILITY_CONTROLLER_H_
+
+#include "base/compiler_specific.h"
+#include "base/logging.h"
+#include "ui/aura/client/visibility_client.h"
+#include "ui/wm/wm_export.h"
+
+namespace wm {
+
+class WM_EXPORT VisibilityController
+    : public aura::client::VisibilityClient {
+ public:
+  VisibilityController();
+  virtual ~VisibilityController();
+
+ protected:
+  // Subclasses override if they want to call a different implementation of
+  // this function.
+  // TODO(beng): potentially replace by an actual window animator class in
+  //             window_animations.h.
+  virtual bool CallAnimateOnChildWindowVisibilityChanged(aura::Window* window,
+                                                         bool visible);
+
+ private:
+  // Overridden from aura::client::VisibilityClient:
+  virtual void UpdateLayerVisibility(aura::Window* window,
+                                     bool visible) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(VisibilityController);
+};
+
+// Suspends the animations for visibility changes during the lifetime of an
+// instance of this class.
+//
+// Example:
+//
+// void ViewName::UnanimatedAction() {
+//   SuspendChildWindowVisibilityAnimations suspend(parent);
+//   // Perform unanimated action here.
+//   // ...
+//   // When the method finishes, visibility animations will return to their
+//   // previous state.
+// }
+//
+class WM_EXPORT SuspendChildWindowVisibilityAnimations {
+ public:
+  // Suspend visibility animations of child windows.
+  explicit SuspendChildWindowVisibilityAnimations(aura::Window* window);
+
+  // Restore visibility animations to their original state.
+  ~SuspendChildWindowVisibilityAnimations();
+
+ private:
+  // The window to manage.
+  aura::Window* window_;
+
+  // Whether the visibility animations on child windows were originally enabled.
+  const bool original_enabled_;
+
+  DISALLOW_COPY_AND_ASSIGN(SuspendChildWindowVisibilityAnimations);
+};
+
+// Tells |window| to animate visibility changes to its children.
+void WM_EXPORT SetChildWindowVisibilityChangesAnimated(
+    aura::Window* window);
+
+}  // namespace wm
+
+#endif  // UI_WM_CORE_VISIBILITY_CONTROLLER_H_