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

gm/alphagradients.cpp

 /*
  * Copyright 2013 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 "SkCanvas.h"
 #include "SkGradientShader.h"
@@ skipping 20 matching lines @@
         paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2,
                                                      SkShader::kClamp_TileMode, flags, nullptr));
         canvas->drawRect(r, paint);
 
         paint.setShader(nullptr);
         paint.setStyle(SkPaint::kStroke_Style);
         canvas->drawRect(r, paint);
     }
 
     void onDraw(SkCanvas* canvas) override {
-        static const struct {
+        constexpr struct {
             SkColor fColor0;
             SkColor fColor1;
         } gRec[] = {
             { 0xFFFFFFFF, 0x00000000 },
             { 0xFFFFFFFF, 0x00FF0000 },
             { 0xFFFFFFFF, 0x00FFFF00 },
             { 0xFFFFFFFF, 0x00FFFFFF },
             { 0xFFFF0000, 0x00000000 },
             { 0xFFFF0000, 0x00FF0000 },
             { 0xFFFF0000, 0x00FFFF00 },
@@ skipping 17 matching lines @@
             canvas->restore();
             canvas->translate(r.width() + 10, 0);
         }
     }
 
 private:
     typedef skiagm::GM INHERITED;
 };
 
 DEF_GM(return new AlphaGradientsGM;)