ui: Add methods to clamp Sizes, Points, and Vectors from above or below.

ui/gfx/point_base.h

 // 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_GFX_POINT_BASE_H_
 #define UI_GFX_POINT_BASE_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 23 matching lines @@
   }
 
   void operator+=(const VectorClass& other) {
     Offset(other.x(), other.y());
   }
 
   void operator-=(const VectorClass& other) {
     Offset(-other.x(), -other.y());
   }
 
+  void ClampFromAbove(const Class& other) {

[sky, 2012/11/09 18:23:12]

Is there some other name we could use for these that doesn't imply the
coordinates in a particular direction?

+    x_ = x_ <= other.x_ ? x_ : other.x_;
+    y_ = y_ <= other.y_ ? y_ : other.y_;
+  }
+
+  void ClampFromBelow(const Class& other) {
+    x_ = x_ >= other.x_ ? x_ : other.x_;
+    y_ = y_ >= other.y_ ? y_ : other.y_;
+  }
+
   Class Add(const VectorClass& other) const WARN_UNUSED_RESULT {
     const Class* orig = static_cast<const Class*>(this);
     Class copy = *orig;
     copy.Offset(other.x(), other.y());
     return copy;
   }
 
   Class Subtract(const VectorClass& other) const WARN_UNUSED_RESULT {
     const Class* orig = static_cast<const Class*>(this);
     Class copy = *orig;
@@ skipping 34 matching lines @@
   ~PointBase() {}
 
  private:
   Type x_;
   Type y_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_POINT_BASE_H_