Fix up -Winconsistent-missing-override

bench/RegionBench.cpp

Index: bench/RegionBench.cpp
diff --git a/bench/RegionBench.cpp b/bench/RegionBench.cpp
index 84e8d1b057c9a50375ceafeb147b22a45abf8137..2188cb374023d5013ab260034bfc1f736f52e138 100644
--- a/bench/RegionBench.cpp
+++ b/bench/RegionBench.cpp
@@ -104,9 +104,9 @@ public:
     }
 
 protected:
-    virtual const char* onGetName() { return fName.c_str(); }
+    const char* onGetName() override { return fName.c_str(); }
 
-    virtual void onDraw(const int loops, SkCanvas* canvas) {
+    void onDraw(const int loops, SkCanvas* canvas) override {
         Proc proc = fProc;
         for (int i = 0; i < loops; ++i) {
             proc(fA, fB);