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

gm/colorcube.cpp

 /*
  * Copyright 2014 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 "SkColorCubeFilter.h"
 #include "SkData.h"
 #include "SkGradientShader.h"
 #include "SkTemplates.h"
 
 namespace skiagm {
 
 static sk_sp<SkShader> MakeLinear() {
-    static const SkPoint pts[2] = {
+    constexpr SkPoint pts[2] = {
             { 0, 0 },
             { SkIntToScalar(80), SkIntToScalar(80) }
         };
-    static const SkColor colors[] = { SK_ColorYELLOW, SK_ColorBLUE };
+    constexpr SkColor colors[] = { SK_ColorYELLOW, SK_ColorBLUE };
     return SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkShader::kRepeat_TileMode, 0,
                                         &SkMatrix::I());
 }
 
 class ColorCubeGM : public GM {
 public:
     ColorCubeGM() : fInitialized(false) {
         this->setBGColor(0xFF000000);
     }
 
@@ skipping 83 matching lines @@
     sk_sp<SkData> f3DLut32;
     sk_sp<SkData> f3DLut64;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new ColorCubeGM; }
 static GMRegistry reg(MyFactory);
 
 }