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This connects the WebUI at chrome://tab-strip to the ThumbnailImage
infrastructure through an intermediate class ThumbnailTracker.

Bug: 991393
Change-Id: I7a730dea9f90db420c32b7cc4871b0608f447c2d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758920
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Reviewed-by: Albert J. Wong <ajwong@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693911}