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

gm/pictureimagegenerator.cpp

 /*
  * Copyright 2015 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 "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkGradientShader.h"
 #include "SkImageGenerator.h"
 #include "SkPaint.h"
 #include "SkPathOps.h"
 #include "SkPicture.h"
 #include "SkPictureRecorder.h"
 
 static void draw_vector_logo(SkCanvas* canvas, const SkRect& viewBox) {
-    static const char kSkiaStr[] = "SKIA";
-    static const SkScalar kGradientPad = .1f;
-    static const SkScalar kVerticalSpacing = 0.25f;
-    static const SkScalar kAccentScale = 1.20f;
+    constexpr char kSkiaStr[] = "SKIA";
+    constexpr SkScalar kGradientPad = .1f;
+    constexpr SkScalar kVerticalSpacing = 0.25f;
+    constexpr SkScalar kAccentScale = 1.20f;
 
     SkPaint paint;
     paint.setAntiAlias(true);
     paint.setSubpixelText(true);
     paint.setFakeBoldText(true);
     sk_tool_utils::set_portable_typeface(&paint);
 
     SkPath path;
     SkRect iBox, skiBox, skiaBox;
     paint.getTextPath("SKI", 3, 0, 0, &path);
@@ skipping 140 matching lines @@
 private:
     sk_sp<SkPicture> fPicture;
 
     const SkScalar kPictureWidth = 200;
     const SkScalar kPictureHeight = 100;
 
     typedef skiagm::GM INHERITED;
 };
 
 DEF_GM(return new PictureGeneratorGM;)