Add override to GrAAFillRectBatch::onCombineIfPossible

src/gpu/batches/GrAAFillRectBatch.cpp

Index: src/gpu/batches/GrAAFillRectBatch.cpp
diff --git a/src/gpu/batches/GrAAFillRectBatch.cpp b/src/gpu/batches/GrAAFillRectBatch.cpp
index 73a0c4bad75555257ff92aac295ee43c5f1be2a8..441e72af8b6c4cfd0b9a0a80e8ffd0c151f42729 100644
--- a/src/gpu/batches/GrAAFillRectBatch.cpp
+++ b/src/gpu/batches/GrAAFillRectBatch.cpp
@@ -175,7 +175,7 @@ private:
     const SkMatrix& viewMatrix() const { return fGeoData[0].fViewMatrix; }
     bool coverageIgnored() const { return fBatch.fCoverageIgnored; }
 
-    bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) {
+    bool onCombineIfPossible(GrBatch* t, const GrCaps& caps) override {
         if (!GrPipeline::CanCombine(*this->pipeline(), this->bounds(), *t->pipeline(), t->bounds(),
                                 caps)) {
             return false;