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The keys are GOOGLE_WEB_PROPERTIES_FIRST_PARTY and
GOOGLE_WEB_PROPERTIES_TRIGGER_FIRST_PARTY.

The new keys will be used to limit the set of experiment IDs included in
X-Client-Data headers sent in third-party contexts when the
RestrictGoogleWebVisibility feature is enabled. Note that the feature is
disabled by default.

Also, update relevant code to consider IDs associated with the new
FIRST_PARTY groups. To do this, GetVariationsVector() and
GetVariationsString() were changed to accept collections of
IDCollectionKeys.

Bug: 1094303
Change-Id: If931d8281f5a687548427101e07f3b3075cd349b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367989Reviewed-by: Dan H <harringtond@chromium.org>
Reviewed-by: Matthias Körber <koerber@google.com>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#806803}