Fix up -Winconsistent-missing-override

bench/InterpBench.cpp

Index: bench/InterpBench.cpp
diff --git a/bench/InterpBench.cpp b/bench/InterpBench.cpp
index 9d8f32de038060e77daf7b14051a1cd4f37c0475..8171131ebc3bc084feb26889092fb1985167d28e 100644
--- a/bench/InterpBench.cpp
+++ b/bench/InterpBench.cpp
@@ -1,3 +1,10 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
 #include "Benchmark.h"
 #include "SkColorPriv.h"
 #include "SkMatrix.h"
@@ -31,11 +38,11 @@ public:
 protected:
     virtual int mulLoopCount() const { return 1; }
 
-    virtual const char* onGetName() {
+    const char* onGetName() override {
         return fName.c_str();
     }
 
-    virtual void onDraw(const int loops, SkCanvas*) {
+    void onDraw(const int loops, SkCanvas*) override {
         int n = loops * this->mulLoopCount();
         for (int i = 0; i < n; i++) {
             this->performTest(fDst, fFx, fDx, kBuffer);