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 params object is unexpectedly created with both a main
frame routing ID and a proxy routing ID.

BUG=575245
TEST=Crash dumps in RenderViewHostImpl::CreateRenderView.

Review URL: https://codereview.chromium.org/1624413002

Cr-Commit-Position: refs/heads/master@{#371336}
1 file changed