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Upon investigating the associated bug, I noticed that there are a few
subclasses of ImageView that exist solely to override OnThemeChanged.
Since I also needed a subclass like this to fix the bug, I decided to
make a utility class to eliminate this ad-hoc subclassing, in the style
of ColorTrackingVectorImageButton (in image_button_factory.cc).

Bug: 1125510
Change-Id: I975a9b6a4676bb6b2a454172f211f406934d7869
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2397737
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804901}