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-Adds complex categories that support 2 developer buttons

-Moves all init methods from builders to the base builder

-Modifies response builder to accommodate for developer buttons

-Tests the built category and its response

Bug: 1136061
Change-Id: Ifabb0d06e8379f957ff8af7ab4bc8ea2228cf38d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2471637
Commit-Queue: Mohamed Adel <adelm@google.com>
Reviewed-by: Richard Knoll <knollr@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817457}