Make various gfx classes more amenable to use as compile-time constants.

ui/gfx/geometry/point.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 UI_GFX_GEOMETRY_POINT_H_
 #define UI_GFX_GEOMETRY_POINT_H_
 
 #include <iosfwd>
 #include <string>
 #include <tuple>
 
 #include "build/build_config.h"
 #include "ui/gfx/geometry/vector2d.h"
 #include "ui/gfx/gfx_export.h"
 
 #if defined(OS_WIN)
 typedef unsigned long DWORD;
 typedef struct tagPOINT POINT;
 #elif defined(OS_MACOSX)
 typedef struct CGPoint CGPoint;
 #endif
 
 namespace gfx {
 
 // A point has an x and y coordinate.
 class GFX_EXPORT Point {
  public:
-  Point() : x_(0), y_(0) {}
-  Point(int x, int y) : x_(x), y_(y) {}
+  constexpr Point() : x_(0), y_(0) {}
+  constexpr Point(int x, int y) : x_(x), y_(y) {}
 #if defined(OS_WIN)
   // |point| is a DWORD value that contains a coordinate.  The x-coordinate is
   // the low-order short and the y-coordinate is the high-order short.  This
   // value is commonly acquired from GetMessagePos/GetCursorPos.
   explicit Point(DWORD point);
   explicit Point(const POINT& point);
   Point& operator=(const POINT& point);
 #elif defined(OS_MACOSX)
   explicit Point(const CGPoint& point);
 #endif
 
-  ~Point() {}
-
 #if defined(OS_WIN)
   POINT ToPOINT() const;
 #elif defined(OS_MACOSX)
   CGPoint ToCGPoint() const;
 #endif
 
-  int x() const { return x_; }
-  int y() const { return y_; }
+  constexpr int x() const { return x_; }
+  constexpr int y() const { return y_; }
   void set_x(int x) { x_ = x; }
   void set_y(int y) { y_ = y; }
 
   void SetPoint(int x, int y) {
     x_ = x;
     y_ = y;
   }
 
   void Offset(int delta_x, int delta_y) {
     x_ += delta_x;
@@ skipping 78 matching lines @@
                                      float y_scale);
 GFX_EXPORT Point ScaleToFlooredPoint(const Point& point, float x_scale);
 GFX_EXPORT Point ScaleToRoundedPoint(const Point& point,
                                      float x_scale,
                                      float y_scale);
 GFX_EXPORT Point ScaleToRoundedPoint(const Point& point, float x_scale);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_POINT_H_