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In this implementation, all script streamer actions are controlled by
ClassicPendingScript, and ScriptRunner ends up asking ClassicPendingScript
to perform the streaming. To facilitate this, ClassicPendingScript has a
new state kReadyStreaming, for cases where we start streaming while the
script has already been 'ready' (and stays 'ready').

Bug: 557466
Change-Id: I990920830af3a820f530f360347f6fa98d8754c2
Reviewed-on: https://chromium-review.googlesource.com/519168Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488648}