[AW] Add ability to specify profiles at startup

Apps pay the cost of creating the default profile all the time, even if
they are not going to use it as they can initialize a different
profile and set it on WebView using the TAG name workaround.

This CL adds the ability to initialize a set of profiles during startup
and makes the default profile lazily initialized so apps only pay the
default profile init cost if they need it.

Change-Id: I195e8618d427c77eff883d47686417eedeb6774c
Bug: 414322772
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6607356
Reviewed-by: Chidera Olibie <colibie@google.com>
Auto-Submit: Sayed Elabady <elabadysayed@chromium.org>
Commit-Queue: Sayed Elabady <elabadysayed@chromium.org>
Reviewed-by: Richard (Torne) Coles <torne@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1481479}