Split GrContext's AA Rect drawing methods into helper class

http://codereview.appspot.com/6300070/



git-svn-id: http://skia.googlecode.com/svn/trunk@4233 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/gmmain.cpp b/gm/gmmain.cpp
index 5cc407a..e91ea8f 100644
--- a/gm/gmmain.cpp
+++ b/gm/gmmain.cpp
@@ -1088,6 +1088,7 @@
 
     PRINT_INST_COUNT(SkRefCnt);
     PRINT_INST_COUNT(GrResource);
+    PRINT_INST_COUNT(GrAARectRenderer);
 
     return (0 == testsFailed) ? 0 : -1;
 }