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This CL improves the error messages for array parse failures in
generated code.

BUG=1113513

Change-Id: Ic1edfab5e005f363b8670b1f798a241673b856ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2520799Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827471}