Fix up -Winconsistent-missing-override

gm/complexclip2.cpp

Index: gm/complexclip2.cpp
diff --git a/gm/complexclip2.cpp b/gm/complexclip2.cpp
index dfec4e73e1e6ad6f571c8b1e66a1997dbad75752..9357884c6e7bf1992cba4cf4032347abcdbed9bb 100644
--- a/gm/complexclip2.cpp
+++ b/gm/complexclip2.cpp
@@ -118,7 +118,7 @@ protected:
         return "";
     }
 
-    virtual SkString onShortName() {
+    SkString onShortName() override {
         if (kRect_Clip == fClip && !fAntiAlias) {
             return SkString("complexclip2");
         }
@@ -130,12 +130,12 @@ protected:
         return str;
     }
 
-    virtual SkISize onISize() {
+    SkISize onISize() override {
         return SkISize::Make(SkScalarRoundToInt(fTotalWidth),
                              SkScalarRoundToInt(fTotalHeight));
     }
 
-    virtual void onDraw(SkCanvas* canvas) {
+    void onDraw(SkCanvas* canvas) override {
         SkPaint rectPaint;
         rectPaint.setStyle(SkPaint::kStroke_Style);
         rectPaint.setStrokeWidth(-1);