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/beziereffects.cpp b/gm/beziereffects.cpp
index ff75f74..1886a4a 100644
--- a/gm/beziereffects.cpp
+++ b/gm/beziereffects.cpp
@@ -122,7 +122,7 @@
     void onDraw(SkCanvas* canvas) override {
         GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
         if (nullptr == rt) {
-            this->drawGpuOnlyMessage(canvas);
+            skiagm::GM::DrawGpuOnlyMessage(canvas);
             return;
         }
         GrContext* context = rt->getContext();
@@ -270,7 +270,7 @@
     void onDraw(SkCanvas* canvas) override {
         GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
         if (nullptr == rt) {
-            this->drawGpuOnlyMessage(canvas);
+            skiagm::GM::DrawGpuOnlyMessage(canvas);
             return;
         }
         GrContext* context = rt->getContext();
@@ -513,7 +513,7 @@
     void onDraw(SkCanvas* canvas) override {
         GrRenderTarget* rt = canvas->internal_private_accessTopLayerRenderTarget();
         if (nullptr == rt) {
-            this->drawGpuOnlyMessage(canvas);
+            skiagm::GM::DrawGpuOnlyMessage(canvas);
             return;
         }
         GrContext* context = rt->getContext();