Add an OR operator overload for SaveFlags to avoid extra static casts.

include/core/SkCanvas.h

Index: include/core/SkCanvas.h
diff --git a/include/core/SkCanvas.h b/include/core/SkCanvas.h
index 81dcfe19b0fcfeca4c22815de439b7d6acc0c31d..7da0b3d766469ed9c88993b0d8f90af4525c8150 100644
--- a/include/core/SkCanvas.h
+++ b/include/core/SkCanvas.h
@@ -1507,4 +1507,16 @@ private:
     size_t      fRowBytes;
 };
 
+static inline SkCanvas::SaveFlags operator|(const SkCanvas::SaveFlags lhs,
+                                            const SkCanvas::SaveFlags rhs) {
+    return static_cast<SkCanvas::SaveFlags>(lhs | rhs);
+}
+
+static inline SkCanvas::SaveFlags& operator|=(SkCanvas::SaveFlags& lhs,
+                                              const SkCanvas::SaveFlags rhs) {
+    lhs = lhs | rhs;
+    return lhs;
+}
+
+
 #endif