Add more fail safes to Extension Event Router.

To investigate a crash on ChromeOS, fail safe code and reporting are
added to EventRouter dispatcher.

Bug: 870838
Change-Id: I536a581c142d3b760f5a564507d4251b2b881c0e
Reviewed-on: https://chromium-review.googlesource.com/c/1356587
Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612668}
1 file changed