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

ui/gfx/geometry/point3_f.h

 // Copyright (c) 2011 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_POINT3_F_H_
 #define UI_GFX_GEOMETRY_POINT3_F_H_
 
 #include <iosfwd>
 #include <string>
 
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/vector3d_f.h"
 #include "ui/gfx/gfx_export.h"
 
 namespace gfx {
 
 // A point has an x, y and z coordinate.
 class GFX_EXPORT Point3F {
  public:
-  Point3F() : x_(0), y_(0), z_(0) {}
+  constexpr Point3F() : x_(0), y_(0), z_(0) {}
+  constexpr Point3F(float x, float y, float z) : x_(x), y_(y), z_(z) {}
 
-  Point3F(float x, float y, float z) : x_(x), y_(y), z_(z) {}
-
-  explicit Point3F(const PointF& point) : x_(point.x()), y_(point.y()), z_(0) {}
-
-  ~Point3F() {}
+  constexpr explicit Point3F(const PointF& point)
+      : x_(point.x()), y_(point.y()), z_(0) {}
 
   void Scale(float scale) {
     Scale(scale, scale, scale);
   }
 
   void Scale(float x_scale, float y_scale, float z_scale) {
     SetPoint(x() * x_scale, y() * y_scale, z() * z_scale);
   }
 
-  float x() const { return x_; }
-  float y() const { return y_; }
-  float z() const { return z_; }
+  constexpr float x() const { return x_; }
+  constexpr float y() const { return y_; }
+  constexpr float z() const { return z_; }
 
   void set_x(float x) { x_ = x; }
   void set_y(float y) { y_ = y; }
   void set_z(float z) { z_ = z; }
 
   void SetPoint(float x, float y, float z) {
     x_ = x;
     y_ = y;
     z_ = z;
   }
@@ skipping 68 matching lines @@
 }
 
 // This is declared here for use in gtest-based unit tests but is defined in
 // the gfx_test_support target. Depend on that to use this in your unit test.
 // This should not be used in production code - call ToString() instead.
 void PrintTo(const Point3F& point, ::std::ostream* os);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_POINT3_F_H_