Call write() within render_pictures but not bench_pictures

BUG=skia:2584
R=bsalomon@google.com, robertphillips@google.com, bensong@google.com

Author: epoger@google.com

Review URL: https://codereview.chromium.org/291843010

git-svn-id: http://skia.googlecode.com/svn/trunk@14837 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/tools/render_pictures_main.cpp b/tools/render_pictures_main.cpp
index cbbca7a..e054acf 100644
--- a/tools/render_pictures_main.cpp
+++ b/tools/render_pictures_main.cpp
@@ -206,6 +206,7 @@
     }
 
     renderer.setup();
+    renderer.enableWrites();
 
     bool success = renderer.render(out);
     if (!success) {