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

gm/imagemagnifier.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 "SkImageSource.h"
 #include "SkMagnifierImageFilter.h"
@@ skipping 54 matching lines @@
 DEF_SIMPLE_GM_BG(imagemagnifier_cropped, canvas, WIDTH_HEIGHT, WIDTH_HEIGHT, SK_ColorBLACK) {
 
     sk_sp<SkImage> image(make_img());
 
     sk_sp<SkImageFilter> imageSource(SkImageSource::Make(std::move(image)));
 
     SkRect srcRect = SkRect::MakeWH(SkIntToScalar(WIDTH_HEIGHT-32),
                                     SkIntToScalar(WIDTH_HEIGHT-32));
     srcRect.inset(64.0f, 64.0f);
 
-    static const SkScalar kInset = 64.0f;
+    constexpr SkScalar kInset = 64.0f;
 
     // Crop out a 16 pixel ring around the result
     const SkRect rect = SkRect::MakeXYWH(16, 16, WIDTH_HEIGHT-32, WIDTH_HEIGHT-32);
     SkImageFilter::CropRect cropRect(rect);
 
     SkPaint filterPaint;
     filterPaint.setImageFilter(SkMagnifierImageFilter::Make(srcRect, kInset,
                                                             std::move(imageSource),
                                                             &cropRect));
 
     canvas->saveLayer(nullptr, &filterPaint);
     canvas->restore();
 }