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Android currently doesn't report crash stack when renderer hangs.
This CL will ask the renderer process to dump the stack to crash report page, without crashing it.
Maybe i can do this for OOP network process alone for the crbug, but I think in general, we should
have the stack for non-responding renderers.

BUG=934317

Change-Id: I5d039c3c6d026e4b608a4f39da4b71933b19c566
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1498415Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638667}