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Amends an existing IO-thread-bound interface in child processes to obey
a new Crash() message when received. This is to help debug child process
hangs on platforms where we don't get hang crash reports yet.

The message is used by the renderer hang monitor if it detects a hung
renderer and the user agrees to kill it. Crashes resulting from this
change should provide some insight into why renderers are hanging on
Chrome OS.

Bug: 938647
Change-Id: Ifb5dc8c2f755c4a25f3f712145e4ddb9e32a584a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1505832
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638250}