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Allow ScriptExecutor to support multiple frame IDs being specified.
If multiple frame IDs are specified, the script will be injected into
each, returning only when all are complete. If INCLUDE_SUB_FRAMES is
also specified, the script is injected into all frames that are a
subframe of any of the specified frames.

Add browsertests for the same.

Bug: 1148878
Change-Id: I8ba90348a9a55e08972576aeb6ff477a5b39d9b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533412
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: David Bertoni <dbertoni@chromium.org>
Reviewed-by: Kelvin Jiang <kelvinjiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828885}