[ScriptStreaming] Stream small scripts when ScheduledScriptStreaming is enabled.

With scheduled script streaming and background compilation it is now worthwhile to
stream smaller scripts. Enable support for streaming these smaller scripts when
the ScheduledScriptStreaming trial is enabled to investigate performance impact.

BUG=chromium:865098

Change-Id: Ia7691dbe9f8dd970aafda2715a34edc3ef16616b
Reviewed-on: https://chromium-review.googlesource.com/1160653
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580466}
2 files changed