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Instead of setting a single global we now pass argc and argv to
a handler function. Note that we must call base's command line
init first for reasons similar to https://crrev.com/c/1121039 .

Bug: angleproject:2923
Change-Id: I521e07a35537e5167781673564527572d70d18cf
Reviewed-on: https://chromium-review.googlesource.com/c/1338228Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609113}