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diff --git a/ui/gfx/rect.h b/ui/gfx/rect.h
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+// Copyright (c) 2010 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.
+
+// Defines a simple integer rectangle class.  The containment semantics
+// are array-like; that is, the coordinate (x, y) is considered to be
+// contained by the rectangle, but the coordinate (x + width, y) is not.
+// The class will happily let you create malformed rectangles (that is,
+// rectangles with negative width and/or height), but there will be assertions
+// in the operations (such as Contains()) to complain in this case.
+
+#ifndef UI_GFX_RECT_H_
+#define UI_GFX_RECT_H_
+#pragma once
+
+#include <iosfwd>
+
+#include "gfx/point.h"
+#include "gfx/size.h"
+
+#if defined(OS_WIN)
+typedef struct tagRECT RECT;
+#elif defined(USE_X11)
+typedef struct _GdkRectangle GdkRectangle;
+#endif
+
+namespace gfx {
+
+class Insets;
+
+class Rect {
+ public:
+  Rect();
+  Rect(int width, int height);
+  Rect(int x, int y, int width, int height);
+#if defined(OS_WIN)
+  explicit Rect(const RECT& r);
+#elif defined(OS_MACOSX)
+  explicit Rect(const CGRect& r);
+#elif defined(USE_X11)
+  explicit Rect(const GdkRectangle& r);
+#endif
+  explicit Rect(const gfx::Size& size);
+  Rect(const gfx::Point& origin, const gfx::Size& size);
+
+  ~Rect() {}
+
+#if defined(OS_WIN)
+  Rect& operator=(const RECT& r);
+#elif defined(OS_MACOSX)
+  Rect& operator=(const CGRect& r);
+#elif defined(USE_X11)
+  Rect& operator=(const GdkRectangle& r);
+#endif
+
+  int x() const { return origin_.x(); }
+  void set_x(int x) { origin_.set_x(x); }
+
+  int y() const { return origin_.y(); }
+  void set_y(int y) { origin_.set_y(y); }
+
+  int width() const { return size_.width(); }
+  void set_width(int width) { size_.set_width(width); }
+
+  int height() const { return size_.height(); }
+  void set_height(int height) { size_.set_height(height); }
+
+  const gfx::Point& origin() const { return origin_; }
+  void set_origin(const gfx::Point& origin) { origin_ = origin; }
+
+  const gfx::Size& size() const { return size_; }
+  void set_size(const gfx::Size& size) { size_ = size; }
+
+  int right() const { return x() + width(); }
+  int bottom() const { return y() + height(); }
+
+  void SetRect(int x, int y, int width, int height);
+
+  // Shrink the rectangle by a horizontal and vertical distance on all sides.
+  void Inset(int horizontal, int vertical) {
+    Inset(horizontal, vertical, horizontal, vertical);
+  }
+
+  // Shrink the rectangle by the given insets.
+  void Inset(const gfx::Insets& insets);
+
+  // Shrink the rectangle by the specified amount on each side.
+  void Inset(int left, int top, int right, int bottom);
+
+  // Move the rectangle by a horizontal and vertical distance.
+  void Offset(int horizontal, int vertical);
+  void Offset(const gfx::Point& point) {
+    Offset(point.x(), point.y());
+  }
+
+  // Returns true if the area of the rectangle is zero.
+  bool IsEmpty() const { return size_.IsEmpty(); }
+
+  bool operator==(const Rect& other) const;
+
+  bool operator!=(const Rect& other) const {
+    return !(*this == other);
+  }
+
+  // A rect is less than another rect if its origin is less than
+  // the other rect's origin. If the origins are equal, then the
+  // shortest rect is less than the other. If the origin and the
+  // height are equal, then the narrowest rect is less than.
+  // This comparison is required to use Rects in sets, or sorted
+  // vectors.
+  bool operator<(const Rect& other) const;
+
+#if defined(OS_WIN)
+  // Construct an equivalent Win32 RECT object.
+  RECT ToRECT() const;
+#elif defined(USE_X11)
+  GdkRectangle ToGdkRectangle() const;
+#elif defined(OS_MACOSX)
+  // Construct an equivalent CoreGraphics object.
+  CGRect ToCGRect() const;
+#endif
+
+  // Returns true if the point identified by point_x and point_y falls inside
+  // this rectangle.  The point (x, y) is inside the rectangle, but the
+  // point (x + width, y + height) is not.
+  bool Contains(int point_x, int point_y) const;
+
+  // Returns true if the specified point is contained by this rectangle.
+  bool Contains(const gfx::Point& point) const {
+    return Contains(point.x(), point.y());
+  }
+
+  // Returns true if this rectangle contains the specified rectangle.
+  bool Contains(const Rect& rect) const;
+
+  // Returns true if this rectangle intersects the specified rectangle.
+  bool Intersects(const Rect& rect) const;
+
+  // Computes the intersection of this rectangle with the given rectangle.
+  Rect Intersect(const Rect& rect) const;
+
+  // Computes the union of this rectangle with the given rectangle.  The union
+  // is the smallest rectangle containing both rectangles.
+  Rect Union(const Rect& rect) const;
+
+  // Computes the rectangle resulting from subtracting |rect| from |this|.  If
+  // |rect| does not intersect completely in either the x- or y-direction, then
+  // |*this| is returned.  If |rect| contains |this|, then an empty Rect is
+  // returned.
+  Rect Subtract(const Rect& rect) const;
+
+  // Returns true if this rectangle equals that of the supplied rectangle.
+  bool Equals(const Rect& rect) const {
+    return *this == rect;
+  }
+
+  // Fits as much of the receiving rectangle into the supplied rectangle as
+  // possible, returning the result. For example, if the receiver had
+  // a x-location of 2 and a width of 4, and the supplied rectangle had
+  // an x-location of 0 with a width of 5, the returned rectangle would have
+  // an x-location of 1 with a width of 4.
+  Rect AdjustToFit(const Rect& rect) const;
+
+  // Returns the center of this rectangle.
+  Point CenterPoint() const;
+
+  // Return a rectangle that has the same center point but with a size capped
+  // at given |size|.
+  Rect Center(const gfx::Size& size) const;
+
+  // Returns true if this rectangle shares an entire edge (i.e., same width or
+  // same height) with the given rectangle, and the rectangles do not overlap.
+  bool SharesEdgeWith(const gfx::Rect& rect) const;
+
+ private:
+  gfx::Point origin_;
+  gfx::Size size_;
+};
+
+std::ostream& operator<<(std::ostream& out, const gfx::Rect& r);
+
+}  // namespace gfx
+
+#endif  // UI_GFX_RECT_H_