GitLab

Breaks startUpBrowserForegroundInitialization into three methods:
* Code to run before any scene is created
* Code to run to build up a scene/window
* Code to run after at least one scene/window is created

Currently these are broken down simply by the order in which they
appeared in the original method. A follow-up CL will reshuffle
code between these as necessary.

Bug: 1045658
Change-Id: I0c40be3a88d082018a47f13bf3a0876de8cac179
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087751
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746803}