Chromium change: https://source.chromium.org/chromium/chromium/src/+/187fd6cd3fdf5d6125f78de37c7da5c9bc1bd59f [Composeplate] Implement V2 UX with 2 buttons. In this CL, we implement the V2 variations of composeplate view: - Increase Fake search box height to 72dp; - Add the composeplate view with 2 buttons and reduce visible background height to 44dp; - The composeplate button in url_bar is no longer visible when scrolling NTP; - Add a new feature parameter "v2_enabled" for this new UI variation. Screenshots: http://shortn/_tC3hspQIv9. Bug: 421944848 Change-Id: I25d152370dce3497fb347c392665e82c6566d991 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6953030