GM: replace boilerplate with macros

I have verified locally that nothing draws differently.

Motivation:
*   SK_SIMPLE_GM makes it easier to write a GM.
*   Reducing 1100 lines of code makes maintenance easier.
*   Simple GMs are easy to convert to Fiddles.

Review URL: https://codereview.chromium.org/1333553002
diff --git a/gm/texturedomaineffect.cpp b/gm/texturedomaineffect.cpp
index facfb7a..24e09db 100644
--- a/gm/texturedomaineffect.cpp
+++ b/gm/texturedomaineffect.cpp
@@ -75,7 +75,7 @@
         }
         GrContext* context = rt->getContext();
         if (nullptr == context) {
-            this->drawGpuOnlyMessage(canvas);
+            skiagm::GM::DrawGpuOnlyMessage(canvas);
             return;
         }