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Fixes occasional crashes seen in render thread profiling when
attempting to unwind from the sigtramp function in non-leaf frames.

Bug: 831793
Change-Id: Ie07b9679c288262d8409904d4f4fe818324339bf
Reviewed-on: https://chromium-review.googlesource.com/1013337
Commit-Queue: Mike Wittman <wittman@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551151}