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

gm/verttext.cpp

Index: gm/verttext.cpp
diff --git a/gm/verttext.cpp b/gm/verttext.cpp
index 37cf37cbad83a95646708755652c8f2bc2e46354..700fb25e410692f615cada7f1ae10710f07cfe64 100644
--- a/gm/verttext.cpp
+++ b/gm/verttext.cpp
@@ -13,17 +13,17 @@
 namespace skiagm {
 
 #define TEXT_SIZE   48
-static const char gText[] = "Hello";
+constexpr char gText[] = "Hello";
 
 //Before shaping
-//static const char gText[] = "「テスト。」";
-//static const char gText[] = {0xE3,0x80,0x8C, 0xE3,0x83,0x86, 0xE3,0x82,0xB9, 0xE3,0x83,0x88, 0xE3,0x80,0x82, 0xE3,0x80,0x8D, 0x0};
+//constexpr char gText[] = "「テスト。」";
+//constexpr char gText[] = {0xE3,0x80,0x8C, 0xE3,0x83,0x86, 0xE3,0x82,0xB9, 0xE3,0x83,0x88, 0xE3,0x80,0x82, 0xE3,0x80,0x8D, 0x0};
 
 //After shaping
-//static const char gText[] = "﹁テスト︒﹂";
-//static const char gText[] = {0xEF,0xB9,0x81, 0xE3,0x83,0x86, 0xE3,0x82,0xB9, 0xE3,0x83,0x88, 0xEF,0xB8,0x92, 0xEF,0xB9,0x82, 0x0};
+//constexpr char gText[] = "﹁テスト︒﹂";
+//constexpr char gText[] = {0xEF,0xB9,0x81, 0xE3,0x83,0x86, 0xE3,0x82,0xB9, 0xE3,0x83,0x88, 0xEF,0xB8,0x92, 0xEF,0xB9,0x82, 0x0};
 
-static const size_t gLen = sizeof(gText) - sizeof(gText[0]);
+constexpr size_t gLen = sizeof(gText) - sizeof(gText[0]);
 
 class VertTextGM : public GM {
 public: