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

ui/gfx/vector2d_f.h

Index: ui/gfx/vector2d_f.h
diff --git a/ui/gfx/vector2d_f.h b/ui/gfx/vector2d_f.h
index e78c68821b7f2f18d85decfccc30a7ba61a9bddd..6f5bb2294b37a85ce7343fbfd73980d590e0b3fe 100644
--- a/ui/gfx/vector2d_f.h
+++ b/ui/gfx/vector2d_f.h
@@ -38,6 +38,16 @@ class UI_EXPORT Vector2dF {
   void operator+=(const Vector2dF& other) { Add(other); }
   void operator-=(const Vector2dF& other) { Subtract(other); }
 
+  void ClampFromAbove(const Vector2dF& other) {
+    x_ = x_ <= other.x_ ? x_ : other.x_;
+    y_ = y_ <= other.y_ ? y_ : other.y_;
+  }
+
+  void ClampFromBelow(const Vector2dF& other) {
+    x_ = x_ >= other.x_ ? x_ : other.x_;
+    y_ = y_ >= other.y_ ? y_ : other.y_;
+  }
+
   // Gives the square of the diagonal length of the vector.
   double LengthSquared() const;
   // Gives the diagonal length of the vector.