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

gm/patheffects.cpp

Index: gm/patheffects.cpp
diff --git a/gm/patheffects.cpp b/gm/patheffects.cpp
index 9821b3a35d23626f3039235eb912c1930da41257..9a1f62d7c8575d12abead4ea0584e07e9d4bb123 100644
--- a/gm/patheffects.cpp
+++ b/gm/patheffects.cpp
@@ -48,7 +48,7 @@ static void dash_pe(SkPaint* paint) {
     compose_pe(paint);
 }
 
-static const int gXY[] = {
+constexpr int gXY[] = {
 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
 };
 
@@ -73,7 +73,7 @@ static void one_d_pe(SkPaint* paint) {
 }
 
 typedef void (*PE_Proc)(SkPaint*);
-static const PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
+constexpr PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
 
 static void fill_pe(SkPaint* paint) {
     paint->setStyle(SkPaint::kFill_Style);
@@ -98,7 +98,7 @@ static void tile_pe(SkPaint* paint) {
     paint->setPathEffect(MakeTileEffect());
 }
 
-static const PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
+constexpr PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
 
 class PathEffectGM : public GM {
 public: