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This CL is the first pass for error-console such that it no longer looks
completely broken, as well as fixing keyboard navigation. There will be 
follow-up CLs to bring it closer to the design spec as well as adding the
missing dev-tool buttons.

Bug: 768580
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I15d85e0ebe946b11a9a7aaf9f471ba22fe705a97
Reviewed-on: https://chromium-review.googlesource.com/685988
Commit-Queue: Scott Chen <scottchen@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505257}