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Devices sometimes need to upload extra debugging information within a
crash report. This CL makes it optional for devices to upload
additional states.

Bug: internal b/171233251
Test: triggered crash and checked crash report
Change-Id: I696fa84e6719a3e6ec336bd2b3f07d622e7fd75c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2507576Reviewed-by: Sergey Volk <servolk@chromium.org>
Reviewed-by: Yuchen Liu <yucliu@chromium.org>
Commit-Queue: Ying Ye <yingye@google.com>
Cr-Commit-Position: refs/heads/master@{#823208}