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Adds a tint to the leading image view, and moves color- and font-related
code from coordinator to view controller.

Bug: 819235
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Icd9c6f54d6d8b6e35eb9bc4803b42a3dbfd0bbf6
Reviewed-on: https://chromium-review.googlesource.com/1099380
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567219}