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The bug is that images with rendering mode
UIImageRenderingModeAlwaysTemplate do not automatically respond when
the mode changes. To fix this, the view controller will alert the
mediator whenever its own mode changes. The mediator can then use this
value to get the correct icon from the branded image provider, and
update the icon back.

Once the bug is fixed, none of this code is necessary, as the image
should update automatically through UIKit.

Bug: 998090
Change-Id: I4e39f4267724366a26b189112b55ccf9b3b222cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1774284Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#691558}