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First, we make sure we reorder all tests in test launcher,
we guarantee that "PRE_test" will precede "test" for the delegate.

Test shuffeling was moved before re-ordering test for dependent test

Finally, content test launcher delegate was simplified.
It still has some logic to group dependent together
so they run consecutively in parallel launch.

Bug: 936248
Change-Id: I7d34e45eee1c2c0c88ded8e5cc054327fe27d7b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1638139
Commit-Queue: Ilia Samsonov <isamsonov@google.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666365}