SkRecordDraw: skip draw ops when the clip is empty

tools/bench_record.cpp

Index: tools/bench_record.cpp
diff --git a/tools/bench_record.cpp b/tools/bench_record.cpp
index db0ea9b71fe54cea6a457a6280c31dd926d1f0fb..e59744b1dc8d410f12976d2ee83f4410d87e7544 100644
--- a/tools/bench_record.cpp
+++ b/tools/bench_record.cpp
@@ -79,7 +79,7 @@ static void bench_record(SkPicture* src, const char* name, PictureFactory pictur
     for (int i = 0; i < FLAGS_loops; i++) {
         if (FLAGS_skr) {
             SkRecord record;
-            SkRecorder canvas(&record, width, height);
+            SkRecorder canvas(SkRecorder::kWriteOnly_Mode, &record, width, height);
             if (NULL != src) {
                 src->draw(&canvas);
             }