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The stack of currently executing stacks includes a PendingTask field. A
pointer to this field is stored in TLS. However, std::vector does not
guarantee pointer stability on resize.

Bug: 1064891
Change-Id: I04eb06c9521722f08fd72826f552cedaffe61b53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2146349
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759017}