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

gm/distantclip.cpp

Index: gm/distantclip.cpp
diff --git a/gm/distantclip.cpp b/gm/distantclip.cpp
index 9276dadc532141b1a7166b8cc133965b02934f56..07594e788ad674c4b8e8d1a16ec6cf7ac7470bd1 100644
--- a/gm/distantclip.cpp
+++ b/gm/distantclip.cpp
@@ -26,8 +26,8 @@ protected:
     SkISize onISize() { return SkISize::Make(100, 100); }
 
     virtual void onDraw(SkCanvas* canvas) {
-        static const SkScalar kOffset = 35000.0f;
-        static const SkScalar kExtents = 1000.0f;
+        constexpr SkScalar kOffset = 35000.0f;
+        constexpr SkScalar kExtents = 1000.0f;
 
         SkPictureRecorder recorder;
         // We record a picture of huge vertical extents in which we clear the canvas to red, create