Ship `{script,style}-src-{attr,elem}` directives

I2S: https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/uauMQQQ7fAI/UAY5FX9UBgAJ

Bug: 880816
Change-Id: I3fa67e8be79d9cb82da96ab8d2b99c38e12bdbfb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1527526
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Commit-Queue: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641551}
1 file changed