Add right-click user switching tutorial bubble.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 9ff167387c16d4193f475c44b81d63636461d6eb..15a8f9a17ffaaed4a02f91b2dfe422bd54c27168 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1106,6 +1106,11 @@ const char kProfileGAIAInfoPictureURL[] = "profile.gaia_info_picture_url";
 const char kProfileAvatarTutorialShown[] =
     "profile.avatar_bubble_tutorial_shown";
 
+// Boolean that specifies if the user has already dismissed the right-click user
+// switching tutorial.
+const char kProfileAvatarRightClickTutorialDismissed[] =
+    "profile.avatar_bubble_right_click_tutorial_dismissed";
+
 // Indicates if we've already shown a notification that high contrast
 // mode is on, recommending high-contrast extensions and themes.
 const char kInvertNotificationShown[] = "invert_notification_version_2_shown";