GM: replace boilerplate with macros

gm/largeglyphblur.cpp

Index: gm/largeglyphblur.cpp
diff --git a/gm/largeglyphblur.cpp b/gm/largeglyphblur.cpp
index b74f9024b83d3570ed259d722c12ba8ef962b9b2..a4c112328d1e3d7afe2f5ae6c9117f4dc0b94c09 100644
--- a/gm/largeglyphblur.cpp
+++ b/gm/largeglyphblur.cpp
@@ -14,21 +14,7 @@
 
 // This test ensures that glyphs whose point size is less than the SkGlyphCache's maxmium, but
 // who have a large blur, are still handled correctly
-namespace skiagm {
-class LargeGlyphBlur : public GM {
-public:
-    LargeGlyphBlur() {}
-
-protected:
-    SkString onShortName() override {
-        return SkString("largeglyphblur");
-    }
-
-    SkISize onISize() override {
-        return SkISize::Make(kWidth, kHeight);
-    }
-
-    void onDraw(SkCanvas* canvas) override {
+DEF_SIMPLE_GM(largeglyphblur, canvas, 1920, 600) {
         const char text[] = "Hamburgefons";
 
         SkPaint paint;
@@ -54,16 +40,4 @@ protected:
         size_t len = strlen(text);
         canvas->drawText(text, len, 10, 500, blurPaint);
         canvas->drawText(text, len, 10, 500, paint);
-    }
-
-private:
-    static const int kWidth = 1920;
-    static const int kHeight = 600;
-
-    typedef GM INHERITED;
-};
-
-//////////////////////////////////////////////////////////////////////////////
-
-DEF_GM(return new LargeGlyphBlur;)
 }