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For privacy reasons, the native code will have to choose which icon
is served within a single source (so the implementer cannot deduct
history). The priority order is the local favicon, the server favicon
or a letter+circle fallback. This CL implements the first and the
last of those, and further CLs will improve the logic.

Bug: 853780
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I6f56d02f3c953964e4968f191b8fb3177998c962
Reviewed-on: https://chromium-review.googlesource.com/1105508
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569414}