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We have tried to unwind the stack frame and the failure rate of
unwinding android framework frames with libunwind is too high to get
meaningful data. So, scan the stack to find all chrome PCs if unwinding
fails. We can try to sanitize the stack on the server side.

BUG=859260

Change-Id: I689b59f03f6b088576e45667fbad878c67940ba2
Reviewed-on: https://chromium-review.googlesource.com/c/1308717
Commit-Queue: ssid <ssid@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605159}