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

gm/gm.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 "SkShader.h"
 using namespace skiagm;
@@ skipping 62 matching lines @@
 void GM::DrawGpuOnlyMessage(SkCanvas* canvas) {
     SkBitmap bmp;
     bmp.allocN32Pixels(128, 64);
     SkCanvas bmpCanvas(bmp);
     bmpCanvas.drawColor(SK_ColorWHITE);
     SkPaint paint;
     paint.setAntiAlias(true);
     paint.setTextSize(20);
     paint.setColor(SK_ColorRED);
     sk_tool_utils::set_portable_typeface(&paint);
-    static const char kTxt[] = "GPU Only";
+    constexpr char kTxt[] = "GPU Only";
     bmpCanvas.drawText(kTxt, strlen(kTxt), 20, 40, paint);
     SkMatrix localM;
     localM.setRotate(35.f);
     localM.postTranslate(10.f, 0.f);
     paint.setShader(SkShader::MakeBitmapShader(bmp, SkShader::kMirror_TileMode,
                                                SkShader::kMirror_TileMode,
                                                &localM));
     paint.setFilterQuality(kMedium_SkFilterQuality);
     canvas->drawPaint(paint);
     return;
 }
 
 // need to explicitly declare this, or we get some weird infinite loop llist
 template GMRegistry* GMRegistry::gHead;
 
 void skiagm::SimpleGM::onDraw(SkCanvas* canvas) {
     fDrawProc(canvas);
 }
 
 SkISize skiagm::SimpleGM::onISize() {
     return fSize;
 }
 
 SkString skiagm::SimpleGM::onShortName() {
     return fName;
 }