Replace a lot of 'static const' with 'constexpr' or 'const'.

gm/lighting.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkAnimTimer.h"
 #include "SkLightingImageFilter.h"
@@ skipping 140 matching lines @@
                                                                             shininess,
                                                                             input,
                                                                             cr));
             drawClippedBitmap(canvas, paint, 220, y);
 
             y += 110;
         }
     }
 
     bool onAnimate(const SkAnimTimer& timer) override {
-        static const SkScalar kDesiredDurationSecs = 15.0f;
+        constexpr SkScalar kDesiredDurationSecs = 15.0f;
 
         fAzimuth = kStartAzimuth + timer.scaled(360.0f/kDesiredDurationSecs, 360.0f);
         return true;
     }
 
 private:
-    static const int kStartAzimuth = 225;
+    static constexpr int kStartAzimuth = 225;
 
     SkBitmap fBitmap;
     SkScalar fAzimuth;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM(return new ImageLightingGM;)
 }