ui: Prefer +/- operators to apply offsets.

ui/gfx/rect.cc

 // 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.
 
 #include "ui/gfx/rect.h"
 
 #include <algorithm>
 
 #if defined(OS_WIN)
 #include <windows.h>
@@ skipping 72 matching lines @@
   return r;
 }
 #endif
 
 std::string Rect::ToString() const {
   return base::StringPrintf("%s %s",
                             origin().ToString().c_str(),
                             size().ToString().c_str());
 }
 
+Rect operator+(const Rect& lhs, const Vector2d& rhs) {
+  Rect result(lhs);
+  result += rhs;
+  return result;
+}
+
+Rect operator-(const Rect& lhs, const Vector2d& rhs) {
+  Rect result(lhs);
+  result -= rhs;
+  return result;
+}
+
 Rect IntersectRects(const Rect& a, const Rect& b) {
   Rect result = a;
   result.Intersect(b);
   return result;
 }
 
 Rect UnionRects(const Rect& a, const Rect& b) {
   Rect result = a;
   result.Union(b);
   return result;
 }
 
 Rect SubtractRects(const Rect& a, const Rect& b) {
   Rect result = a;
   result.Subtract(b);
   return result;
 }
 
 Rect BoundingRect(const Point& p1, const Point& p2) {
   int rx = std::min(p1.x(), p2.x());
   int ry = std::min(p1.y(), p2.y());
   int rr = std::max(p1.x(), p2.x());
   int rb = std::max(p1.y(), p2.y());
   return Rect(rx, ry, rr - rx, rb - ry);
 }
 
 }  // namespace gfx