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My intention is to merge this to 88.

This adds the following changes to cct:
1. context menu when in incognito mode no longer shows
   'open in chrome'. As the app menu explicitly doesn't show 'open in
   chrome' I'm assuming it's an over site that 'open in chrome' is
   shown in the context menu. If this isn't an over site, I can hide
   this behind the flag I previously added.
2. Makes it possible for first parties to use this regardless of the
   feature state if an extra is present. Reason for this is I plan to
   merge this to 88, in which the feature is disabled.
3. Makes it possible for colors to come from the intent. This is only
   enabled if an extra is present in the bundle and restricted to first
   parties.
4. Makes it possible for not show the incognito icon. This is only
   enabled if an extra is present in the bundle and restricted to first
   parties.

BUG=1157916
TEST=Various tests in CustomTabActivityIncognitoTest

Change-Id: I812f46e935dcae01b8d161893059ecf81c146522
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2582643
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Rohit Agarwal <roagarwal@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837117}