ps test.

cc/base/index_rect.h

 // Copyright 2016 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.
 
 #ifndef CC_BASE_INDEX_RECT_H_
 #define CC_BASE_INDEX_RECT_H_
 
 #include <string>
 
 #include "cc/base/cc_export.h"
@@ skipping 82 matching lines @@
   }
 
   // Clamp indices to the given IndexRect indices. For non-intersecting rects,
   // it makes this index rect invalid.
   void ClampTo(const IndexRect& other);
 
   // Returns true if the given index identified by index_x and index_y falls
   // inside this index rectangle, including edge indices.
   bool Contains(int index_x, int index_y) const;
 
+  // Shrink the index rect by the specified amount on each side.
+  void Inset(int left, int right, int top, int bottom);
+
   std::string ToString() const;
 
  private:
   int left_;
   int right_;
   int top_;
   int bottom_;
 };
 
 inline bool operator==(const IndexRect& lhs, const IndexRect& rhs) {
   return lhs.left() == rhs.left() && lhs.right() == rhs.right() &&
          lhs.top() == rhs.top() && lhs.bottom() == rhs.bottom();
 }
 
 inline bool operator!=(const IndexRect& lhs, const IndexRect& rhs) {
   return !(lhs == rhs);
 }
 
 }  // namespace cc
 
 #endif  // CC_BASE_INDEX_RECT_H_