Add new E2E sync multi profiles tests. This should not affect any existing

chrome/browser/sync/test/integration/bookmarks_helper.h

Index: chrome/browser/sync/test/integration/bookmarks_helper.h
diff --git a/chrome/browser/sync/test/integration/bookmarks_helper.h b/chrome/browser/sync/test/integration/bookmarks_helper.h
index 036a3909db0e352d61574b09a7df57cb413716a6..dcdbc45f6690197fff4dd7141a282c8fc6e581b9 100644
--- a/chrome/browser/sync/test/integration/bookmarks_helper.h
+++ b/chrome/browser/sync/test/integration/bookmarks_helper.h
@@ -135,6 +135,12 @@ void SortChildren(int profile, const BookmarkNode* parent);
 // model of profile |profile|.
 void ReverseChildOrder(int profile, const BookmarkNode* parent);
 
+// Sends sync refresh notification for bookmarks model set of profile |profile|.
+void NotifyBookmarksSync(int profile);
+
+// Sends sync refresh notification for bookmarks model set to all profiles.
+void NotifyBookmarksSyncToAllProfiles();
+
 // Checks if the bookmark model of profile |profile| matches the verifier
 // bookmark model. Returns true if they match.
 bool ModelMatchesVerifier(int profile) WARN_UNUSED_RESULT;
@@ -171,6 +177,9 @@ const BookmarkNode* GetUniqueNodeByURL(
     int profile,
     const GURL& url) WARN_UNUSED_RESULT;
 
+// Returns the number of bookmarks in bookmark model of profile |profile|.
+int CountAllBookmarks(int profile) WARN_UNUSED_RESULT;
+
 // Returns the number of bookmarks in bookmark model of profile |profile|
 // whose titles match the string |title|.
 int CountBookmarksWithTitlesMatching(