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

gm/glyph_pos_align.cpp

Index: gm/glyph_pos_align.cpp
diff --git a/gm/glyph_pos_align.cpp b/gm/glyph_pos_align.cpp
index 0ac877d0d0a2d3855e98b847bd2ea6185f448cc3..e0bf83e4f21ab7f19f99028e0a03f12eb7147cb4 100644
--- a/gm/glyph_pos_align.cpp
+++ b/gm/glyph_pos_align.cpp
@@ -12,10 +12,10 @@
 /**
  * This test exercises drawPosTextH and drawPosText with every text align.
  */
-static const int kWidth = 480;
-static const int kHeight = 600;
-static const SkScalar kTextHeight = 64.0f;
-static const int kMaxStringLength = 12;
+constexpr int kWidth = 480;
+constexpr int kHeight = 600;
+constexpr SkScalar kTextHeight = 64.0f;
+constexpr int kMaxStringLength = 12;
 
 static void drawTestCase(SkCanvas*, const char*, SkScalar, const SkPaint&);