SkRecordDraw: skip draw ops when the clip is empty

tools/bench_record.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCommandLineFlags.h"
 #include "SkForceLinking.h"
 #include "SkGraphics.h"
@@ skipping 61 matching lines @@
 }
 
 static void bench_record(SkPicture* src, const char* name, PictureFactory pictureFactory) {
     const SkMSec start = SkTime::GetMSecs();
     const int width  = src ? src->width()  : FLAGS_nullSize;
     const int height = src ? src->height() : FLAGS_nullSize;
 
     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);
             }
         } else {
             int recordingFlags = FLAGS_flags;
             SkAutoTUnref<SkPicture> dst(pictureFactory(width, height, &recordingFlags));
             SkCanvas* canvas = dst->beginRecording(width, height, recordingFlags);
             if (NULL != src) {
                 src->draw(canvas);
             }
@@ skipping 44 matching lines @@
         bench_record(src, filename.c_str(), pictureFactory);
     }
     return failed ? 1 : 0;
 }
 
 #if !defined SK_BUILD_FOR_IOS
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif