Move SaturatedArithmetic from Blink to base

ui/gfx/geometry/size.cc

Index: ui/gfx/geometry/size.cc
diff --git a/ui/gfx/geometry/size.cc b/ui/gfx/geometry/size.cc
index 33f5de17c353d85a2e2136155015cc2910a17c27..69486723a1de43ef2eb487b9c24658764119f475 100644
--- a/ui/gfx/geometry/size.cc
+++ b/ui/gfx/geometry/size.cc
@@ -13,6 +13,7 @@
 #endif
 
 #include "base/numerics/safe_math.h"
+#include "base/numerics/saturated_arithmetic.h"
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "ui/gfx/geometry/safe_integer_conversions.h"
@@ -57,7 +58,8 @@ base::CheckedNumeric<int> Size::GetCheckedArea() const {
 }
 
 void Size::Enlarge(int grow_width, int grow_height) {
-  SetSize(SafeAdd(width(), grow_width), SafeAdd(height(), grow_height));
+  SetSize(base::SaturatedAddition(width(), grow_width),
+          base::SaturatedAddition(height(), grow_height));
 }
 
 void Size::SetToMin(const Size& other) {