Wire up basic Jump-Start Omnibox functionality.

When the Jump-Start Omnibox feature is enabled and the relevant
time criteria are met, starting Chrome from the Launcher icon will
redirect the User to a much lighter Search Activity.

This change offers a functional implementation of the JSO, however it
requires further refinement (to be handled in subsequent changes) in
order to further reduce the startup time.

Bug: b:370570081
Change-Id: I2fb62ed95a3e935e54b7c7d216614b9064dd0c19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5913834
Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org>
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Cr-Commit-Position: refs/heads/main@{#1372088}