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Create a utility method to unify the way we create image buttons. This
turns on default ink drop click and focus styles and make them focusable.

Test: manually build and test
Bug: b:112925587
Change-Id: I70c72e033fae2dbad39034d716483c77ea578161
Reviewed-on: https://chromium-review.googlesource.com/1186137
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Muyuan Li <muyuanli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586068}