GitLab

Logs a reason why the XRSession was rejected to the console. This aids
developers in diagnosing what went wrong and (hopefully) how to fix it.
Note that this is logged *only* to the console, and not part of the
promise rejection. Also adds a couple of DVLOGs where there are very
similar rejections.

Also adds two new exception types where similar values were being re-
used but weren't wholly accurate, and removes one that was no longer
logged.

Finally, renames mojom::ConsoleMessage* to mojom::blink::ConsoleMessage*
due to presubmit warnings.

Bug: 872316
Change-Id: I73a70ba702b80c5607ce1ce793422675d1d24686
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135985
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756881}