Add missing SK_OVERRIDE

Tested by running on clang head + ubuntu 14.04:
GYP_DEFINES=”skia_gpu=0 skia_warnings_as_errors=1" tools/xsan_build thread dm BUILDTYPE=Release
out/Release/dm -v

BUG=skia:3386

Review URL: https://codereview.chromium.org/894833002

1 files changed, 1 insertions, 1 deletions

diff --git a/gm/drawlooper.cpp b/gm/drawlooper.cpp
index 1d16fb5955..56b412533a 100644
--- a/gm/drawlooper.cpp
+++ b/gm/drawlooper.cpp
@@ -27,7 +27,7 @@ public:
     }
 
 protected:
-    virtual SkISize onISize() {
+    virtual SkISize onISize() SK_OVERRIDE {
         return SkISize::Make(520, 160);
     }