Spin off GM::runAsBench() from flags.

gm/variedtext.cpp

Index: gm/variedtext.cpp
diff --git a/gm/variedtext.cpp b/gm/variedtext.cpp
index dddd79e9422456a145d6a2ebcbbdaa2f8481bfc7..dba5d70eb6a2c32289dfaae9b941c86482cef712 100644
--- a/gm/variedtext.cpp
+++ b/gm/variedtext.cpp
@@ -139,8 +139,9 @@ protected:
     uint32_t onGetFlags() const SK_OVERRIDE {
         // The aa hairline stroked rects used to visualize the clip draw slightly differently in
         // quilt mode in dm.
-        return kAsBench_Flag | kSkipTiled_Flag;
+        return kSkipTiled_Flag;
     }
+    bool runAsBench() const SK_OVERRIDE { return true; }
 
 private:
     static const int kCnt = 30;