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Sub-scripts part of larger scripts are not explicitly known to the
client, hence status match preconditions could not be applied in that
case. Before this patch, this kind of script filtering was not possible.

This patch introduces a way of updating the list of available scripts
mid script execution by reporting an updated list as part of the get
actions response. The updated list will be used when the script
execution finishes and another round of precondition checks is
triggered.

After this patch, the backend will be able to fine script eligibility
while still being backwards compatible with script status match
preconditions.

Note: This is an intermediate step towards removing the status match
preconditions from the client and handle that entirely in the backend.

R=szermatt@chromium.org

Bug: 806868
Change-Id: Ia29bd0a7bc5a3f00b4b0f736dd28a93f6b422d92
Reviewed-on: https://chromium-review.googlesource.com/c/1352763
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612119}