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

ui/gfx/size_base.h

Index: ui/gfx/size_base.h
diff --git a/ui/gfx/size_base.h b/ui/gfx/size_base.h
index cd7221c345ec701349fbfec0bd317fdc8020fa64..0dbfabddfcf15e4a50cae207abde488e2178479c 100644
--- a/ui/gfx/size_base.h
+++ b/ui/gfx/size_base.h
@@ -35,6 +35,16 @@ class UI_EXPORT SizeBase {
   void set_width(Type width) { width_ = width; }
   void set_height(Type height) { height_ = height; }
 
+  void ClampToMax(const Class& max) {
+    width_ = width_ <= max.width_ ? width_ : max.width_;
+    height_ = height_ <= max.height_ ? height_ : max.height_;
+  }
+
+  void ClampToMin(const Class& min) {
+    width_ = width_ >= min.width_ ? width_ : min.width_;
+    height_ = height_ >= min.height_ ? height_ : min.height_;
+  }
+
   bool IsEmpty() const {
     return (width_ <= 0) || (height_ <= 0);
   }