Fix up -Winconsistent-missing-override

src/utils/debugger/SkDebugCanvas.cpp

Index: src/utils/debugger/SkDebugCanvas.cpp
diff --git a/src/utils/debugger/SkDebugCanvas.cpp b/src/utils/debugger/SkDebugCanvas.cpp
index df0a6d8d9cb3bb28eebb0f79dd3489794eed1c3b..3c166b73daf93d7d4511da87edb07d220072e99d 100644
--- a/src/utils/debugger/SkDebugCanvas.cpp
+++ b/src/utils/debugger/SkDebugCanvas.cpp
@@ -78,7 +78,9 @@ protected:
         }
     }
 
-    void onDrawPicture(const SkPicture* picture, const SkMatrix* matrix, const SkPaint* paint) {
+    void onDrawPicture(const SkPicture* picture,
+                       const SkMatrix* matrix,
+                       const SkPaint* paint) override {
         // We need to replay the picture onto this canvas in order to filter its internal paints.
         this->SkCanvas::onDrawPicture(picture, matrix, paint);
     }