* For #5334: added private custom tab processor

* For #5334 - Fixes up IntentReceiverActivity for handling intents

* For 5334: update styling for private custom tabbs

* For 5334: update tests to account for new processors

Note that two are still failing. These appear to be true failures, and will be corrected in a later commit.

* For 5334: fixes bug introduced by changes to IntentReceiverActivity

RCA: intent className and extra were previously set based on which processors matched, not which successfully processed. This patch reintroduces that behavior.

* For 5334: add tests for custom tabs processing