Add logic to flip Nigori bit to instruct other clients to sync tabs.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 519577dbde4c3e34f741859004ffcf7ab6b7b107..9c23ba613e978e84a96f728417692df489f739cb 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -525,6 +525,10 @@ const char kEnableSyncOAuth[]               = "enable-sync-oauth";
 // Enable syncing browser sessions.
 const char kEnableSyncSessions[]            = "enable-sync-sessions";
 
+// Enable syncing browser sessions for other synced clients.
+const char kEnableSyncSessionsForOtherClients[] =
+    "enable-sync-sessions-for-other-clients";
+
 // Enables context menu for selecting groups of tabs.
 const char kEnableTabGroupsContextMenu[]     = "enable-tab-groups-context-menu";