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This CL adds helper methods to signin_earlgrey_utils_app_interface.*
and converts the following tests:
-testSyncUploadBookmarkOnFirstSync
-testSyncUploadBookmark
-testSyncDownloadBookmark
-testSyncCheckSameCacheGuid_SyncRestarted
-testSyncCheckDifferentCacheGuid_SignOutAndSignIn
-testSyncCheckSameCacheGuid_SyncRestartedAfterSignOutAndSignIn
-testSyncDownloadAutofillProfile
-testSyncUpdateAutofillProfile
-testSyncDeleteAutofillProfile
-testSyncUploadOpenTabs
-testSyncTypedURLUpload
-testSyncTypedUrlDownload
-testSyncTypedURLDeleteFromClient
-testSyncTypedURLDeleteFromServer.

Bug: 987646

Change-Id: I559a90182f78996399bfc1ae9ac98a184c36d914
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1955555
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Auto-Submit: Nazerke Kalidolda <nazerke@google.com>
Cr-Commit-Position: refs/heads/master@{#727468}