add gm: colorwheel

gm/gm.h

Index: gm/gm.h
diff --git a/gm/gm.h b/gm/gm.h
index e48f772f397a093521027abc56720f2955bdcbd3..9df26ebd4c7aad138225333938f978fd522c8626 100644
--- a/gm/gm.h
+++ b/gm/gm.h
@@ -24,6 +24,15 @@
     static skiagm::GM*          SK_MACRO_APPEND_LINE(F_)(void*) { code; } \
     static skiagm::GMRegistry   SK_MACRO_APPEND_LINE(R_)(SK_MACRO_APPEND_LINE(F_));
 
+#define DEF_SIMPLE_GM(F, W, H)                                          \

[mtklein, 2014/10/24 16:47:48]

Let's do this like DEF_TEST?

#define DEF_SIMPLE_GM(NAME, CANVAS, W, H)
   class SK_MACRO_CONCAT(NAME, _GM) : public skiagm::GM {
     void onDraw(SkCanvas*) SK_OVERRIDE:
      ....
   };
   DEF_GM(...);
   void SK_MACRO_CONCAT(NAME, _GM)::onDraw(SkCanvas* CANVAS)

[hal.canary, 2014/10/24 17:22:01]

Done.

+    class SK_MACRO_CONCAT(F, _GM) : public skiagm::GM {                 \
+    protected:                                                          \
+        virtual void onDraw(SkCanvas* canvas) { (F)(canvas); }          \
+        virtual SkISize onISize() { return SkISize::Make((W), (H)); }   \
+        virtual SkString onShortName() { return SkString(#F); }         \
+    };                                                                  \
+    DEF_GM( return SkNEW(SK_MACRO_CONCAT(F, _GM)); )
+
 namespace skiagm {
 
     class GM {