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This CL
1 - Adds TileUmaLogger to omnibox which was missing earlier.
2 - Fixes a bug in TileUmaLogger which wasn't recording top level tiles correctly.
3 - Added tests for TileUmaLogger.

Bug: 1091130
Change-Id: Ie556640c6b301cb26915462973d26c373667ab16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2230318Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775287}