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ExecutePerformActions function is called from testdriver Action API and
Webdriver API, we expect that all the actions expect the last one in
one tick to be sent asynchronously, so that there is no delay between
those actions. To start actions in the next tick, we should wait for
the response from the actions in the current tick, so by default we
should send the last one in the tick synchronously.

Change-Id: Id457bed235f607bd37dcc0bb44ad635b4875fc58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790386Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694819}