Update tools for use of picture stats in GPU optimization decision

tools/bench_pictures_main.cpp

Index: tools/bench_pictures_main.cpp
diff --git a/tools/bench_pictures_main.cpp b/tools/bench_pictures_main.cpp
index b740877cce053a9fbd530df5787b9ebafc50cee7..ac66dc50d644b1be2a27b6896487def4964bc457 100644
--- a/tools/bench_pictures_main.cpp
+++ b/tools/bench_pictures_main.cpp
@@ -197,6 +197,14 @@ static bool run_single_benchmark(const SkString& inputPath,
         return false;
     }
 
+    if (FLAGS_preprocess) {
+        // Because the GPU preprocessing step relies on the in-memory picture
+        // statistics we need to rerecord the picture here
+        SkPictureRecorder recorder;
+        picture->draw(recorder.beginRecording(picture->width(), picture->height(), NULL, 0));
+        picture.reset(recorder.endRecording());
+    }
+
     SkString filename = SkOSPath::Basename(inputPath.c_str());
 
     gWriter.bench(filename.c_str(), picture->width(), picture->height());