Diagnose renderer-side crash with browser-side stack trace.

This will log a crash dump without crashing the browser process, letting
us see how a main frame proxy is unexpectedly recreated.

BUG=575245
TEST=Crash dumps in RenderFrameHostManager::InitRenderFrame.
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_site_isolation

Review URL: https://codereview.chromium.org/1656603002

Cr-Commit-Position: refs/heads/master@{#372772}
3 files changed