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1) Added legal message (clickable) to the offer dialog.

2) Added a Close Button which will be shown when the
user clicks save button and the migration process lasts for more than
5 secs.

3) Modified ChromeAutofillClient to enable passing legal message
to the LocalCardMigrationDialogControllerImpl.

4) Adjusted format/style of the dialog contents according to the mock:
go/autofill-paradise.

5) Added an experiment flag (disabled by default) to control whether we want to show migration
feedback to the user.

Bug: 852904
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ic0ca348fc689486a21d53a76921ee5954cb08295
Reviewed-on: https://chromium-review.googlesource.com/1192688
Commit-Queue: Siyu An <siyua@chromium.org>
Reviewed-by: Mathieu Perreault <mathp@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587886}