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diff --git a/views/controls/resize_area_delegate.h b/views/controls/resize_area_delegate.h
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+++ b/views/controls/resize_area_delegate.h
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+// Copyright (c) 2011 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 VIEWS_CONTROLS_RESIZE_AREA_DELEGATE_H_
+#define VIEWS_CONTROLS_RESIZE_AREA_DELEGATE_H_
+#pragma once
+
+namespace views {
+
+// An interface implemented by objects that want to be notified about the resize
+// event.
+class ResizeAreaDelegate {
+ public:
+  // OnResize is sent when resizing is detected. |resize_amount| specifies the
+  // number of pixels that the user wants to resize by, and can be negative or
+  // positive (depending on direction of dragging and flips according to
+  // locale directionality: dragging to the left in LTR locales gives negative
+  // |resize_amount| but positive amount for RTL). |done_resizing| is true if
+  // the user has released the mouse.
+  virtual void OnResize(int resize_amount, bool done_resizing) = 0;
+
+ protected:
+  virtual ~ResizeAreaDelegate() {}
+};
+
+}  // namespace views
+
+#endif  // VIEWS_CONTROLS_RESIZE_AREA_DELEGATE_H_