Dump crash stack when renderer hangs on Android

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/+/1498415
Reviewed-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}
15 files changed