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This CL adds a test for retrying the load of an extension that had errors.
Both a retry that fails and a retry that succeeds are tested.
This is a follow-up for CL 798123.

Bug: 789751
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I161f35127d5c37769d6c5e577c2e7d6689dbb482
Reviewed-on: https://chromium-review.googlesource.com/807448
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521920}