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/bigrrectaaeffect.cpp b/gm/bigrrectaaeffect.cpp
index 3facc8c..bc0b56a 100644
--- a/gm/bigrrectaaeffect.cpp
+++ b/gm/bigrrectaaeffect.cpp
@@ -34,7 +34,7 @@
GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
GrContext* context = rt ? rt->getContext() : nullptr;
if (!context) {
- this->drawGpuOnlyMessage(canvas);
+ skiagm::GM::DrawGpuOnlyMessage(canvas);
return;
}