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

gm/xfermodeimagefilter.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 "sk_tool_utils.h"
 #include "SkArithmeticMode.h"
@@ skipping 130 matching lines @@
                                                          offsetBackground,
                                                          offsetForeground,
                                                          nullptr));
         DrawClippedPaint(canvas, clipRect, paint, x, y);
         x += fBitmap.width() + MARGIN;
         if (x + fBitmap.width() > WIDTH) {
             x = 0;
             y += fBitmap.height() + MARGIN;
         }
         // Test cropping
-        static const size_t nbSamples = 3;
+        constexpr size_t nbSamples = 3;
         SkXfermode::Mode sampledModes[nbSamples] = {SkXfermode::kOverlay_Mode,
                                                     SkXfermode::kSrcOver_Mode,
                                                     SkXfermode::kPlus_Mode};
         int offsets[nbSamples][4] = {{ 10,  10, -16, -16},
                                      { 10,  10,  10,  10},
                                      {-10, -10,  -6,  -6}};
         for (size_t i = 0; i < nbSamples; ++i) {
             SkIRect cropRect = SkIRect::MakeXYWH(offsets[i][0],
                                                  offsets[i][1],
                                                  fBitmap.width()  + offsets[i][2],
@@ skipping 68 matching lines @@
     sk_sp<SkImage>  fCheckerboard;
 
     typedef GM INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 DEF_GM( return new XfermodeImageFilterGM; );
 
 }