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The unwind tables are stripped from release builds. This CL adds a
script to extract the unwind table sections from unstripped binary and
adds it as an asset file in the apk.
This script is first used in the test apk, when add_unwind_tables_in_apk
is specified. Will be used later added to chrome apk.

BUG=819888

Change-Id: I68d2ea843ed0c7a7a3ee60c48f683e01809ff217
Reviewed-on: https://chromium-review.googlesource.com/954421Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: Siddhartha S <ssid@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542699}