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

gm/strokerects.cpp

 /*
  * Copyright 2011 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 "SkRandom.h"
 
 namespace skiagm {
 
 #define W   400
 #define H   400
 #define N   100
 
-static const SkScalar SW = SkIntToScalar(W);
-static const SkScalar SH = SkIntToScalar(H);
+constexpr SkScalar SW = SkIntToScalar(W);
+constexpr SkScalar SH = SkIntToScalar(H);
 
 class StrokeRectsGM : public GM {
 public:
     StrokeRectsGM() {}
 
 protected:
 
     SkString onShortName() override {
         return SkString("strokerects");
     }
@@ skipping 43 matching lines @@
 private:
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static GM* MyFactory(void*) { return new StrokeRectsGM; }
 static GMRegistry reg(MyFactory);
 
 }