[#8] Pass gfx::Point by const ref.

cc/base/region.h

 // 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.
 
 #ifndef CC_BASE_REGION_H_
 #define CC_BASE_REGION_H_
 
 #include <string>
 
 #include "base/logging.h"
@@ skipping 17 matching lines @@
   ~Region();
 
   const Region& operator=(const gfx::Rect& rect);
   const Region& operator=(const Region& region);
 
   void Swap(Region* region);
   void Clear();
   bool IsEmpty() const;
   int GetRegionComplexity() const;
 
-  bool Contains(gfx::Point point) const;
+  bool Contains(const gfx::Point& point) const;
   bool Contains(const gfx::Rect& rect) const;
   bool Contains(const Region& region) const;
 
   bool Intersects(const gfx::Rect& rect) const;
   bool Intersects(const Region& region) const;
 
   void Subtract(const gfx::Rect& rect);
   void Subtract(const Region& region);
   void Union(const gfx::Rect& rect);
   void Union(const Region& region);
@@ skipping 77 matching lines @@
 
 inline Region UnionRegions(const Region& a, const gfx::Rect& b) {
   Region result = a;
   result.Union(b);
   return result;
 }
 
 }  // namespace cc
 
 #endif  // CC_BASE_REGION_H_