Fix up -Winconsistent-missing-override

bench/InterpBench.cpp

+/*
+ * 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"
 #include "SkPaint.h"
 #include "SkRandom.h"
 #include "SkString.h"
 
 #define TILE(x, width)  (((x) & 0xFFFF) * width >> 16)
 
 class InterpBench : public Benchmark {
@@ skipping 13 matching lines @@
 
     bool isSuitableFor(Backend backend) override {
         return backend == kNonRendering_Backend;
     }
 
     virtual void performTest(int16_t dst[], float x, float dx, int count) = 0;
 
 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);
         }
     }
 
 private:
     typedef Benchmark INHERITED;
 };
 
@@ skipping 105 matching lines @@
     typedef InterpBench INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_BENCH( return new Fixed16D16Interp(); )
 DEF_BENCH( return new Fixed32D32Interp(); )
 DEF_BENCH( return new Fixed16D48Interp(); )
 DEF_BENCH( return new FloatInterp(); )
 DEF_BENCH( return new DoubleInterp(); )