Ensure minidumps capture LazilyDeallocatedDeque size

As a temporary measure add an aliased variable to record the size
of the queue.

Bug: 912541
Change-Id: I874fcc7cb463b3b891fbe875d42539e72d771767
Reviewed-on: https://chromium-review.googlesource.com/c/1371809
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Alex Clarke <alexclarke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615524}
1 file changed