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..2ce7d1d4a7e55a891261f1e37a20a906910029a1 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 ClampToMax(const Vector2dF& max) {
+    x_ = x_ <= max.x_ ? x_ : max.x_;
+    y_ = y_ <= max.y_ ? y_ : max.y_;
+  }
+
+  void ClampToMin(const Vector2dF& min) {
+    x_ = x_ >= min.x_ ? x_ : min.x_;
+    y_ = y_ >= min.y_ ? y_ : min.y_;
+  }
+
   // Gives the square of the diagonal length of the vector.
   double LengthSquared() const;
   // Gives the diagonal length of the vector.