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

gm/modecolorfilters.cpp

Index: gm/modecolorfilters.cpp
diff --git a/gm/modecolorfilters.cpp b/gm/modecolorfilters.cpp
index 4e5d45cf96e5045ee6de71db739c2fc32927d4e7..50bb27f9d8a561db3691e755dd70356660575b17 100644
--- a/gm/modecolorfilters.cpp
+++ b/gm/modecolorfilters.cpp
@@ -16,7 +16,7 @@ namespace skiagm {
 
 // Using gradients because GPU doesn't currently have an implementation of SkColorShader (duh!)
 static sk_sp<SkShader> make_color_shader(SkColor color) {
-    static const SkPoint kPts[] = {{0, 0}, {1, 1}};
+    constexpr SkPoint kPts[] = {{0, 0}, {1, 1}};
     SkColor colors[] = {color, color};
 
     return SkGradientShader::MakeLinear(kPts, colors, nullptr, 2, SkShader::kClamp_TileMode);
@@ -68,10 +68,10 @@ protected:
 
     void onDraw(SkCanvas* canvas) override {
         // size of rect for each test case
-        static const int kRectWidth  = 20;
-        static const int kRectHeight = 20;
+        constexpr int kRectWidth  = 20;
+        constexpr int kRectHeight = 20;
 
-        static const int kCheckSize  = 10;
+        constexpr int kCheckSize  = 10;
 
         if (!fBmpShader) {
             fBmpShader = make_bg_shader(kCheckSize);
@@ -118,7 +118,7 @@ protected:
 
         SkPaint paint;
         int idx = 0;
-        static const int kRectsPerRow = SkMax32(this->getISize().fWidth / kRectWidth, 1);
+        const int kRectsPerRow = SkMax32(this->getISize().fWidth / kRectWidth, 1);
         for (size_t cfm = 0; cfm < SK_ARRAY_COUNT(modes); ++cfm) {
             for (size_t cfc = 0; cfc < SK_ARRAY_COUNT(colors); ++cfc) {
                 paint.setColorFilter(SkColorFilter::MakeModeFilter(colors[cfc], modes[cfm]));