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

chrome/browser/sync/internal_api/syncapi_unittest.cc

Index: chrome/browser/sync/internal_api/syncapi_unittest.cc
diff --git a/chrome/browser/sync/internal_api/syncapi_unittest.cc b/chrome/browser/sync/internal_api/syncapi_unittest.cc
index 1dcc4788db675de22e8a091ce88bf53f7d06beb8..7ca746eda586eddd64222174bd31ef51e2df7b1d 100644
--- a/chrome/browser/sync/internal_api/syncapi_unittest.cc
+++ b/chrome/browser/sync/internal_api/syncapi_unittest.cc
@@ -916,6 +916,28 @@ TEST_F(SyncManagerTest, UpdateEnabledTypes) {
   EXPECT_EQ(2, update_enabled_types_call_count_);
 }
 
+TEST_F(SyncManagerTest, DoNotSyncTabsInNigoriNode) {
+  syncable::ModelTypeSet encrypted_types;
+  encrypted_types.insert(syncable::TYPED_URLS);
+  sync_manager_.MaybeSetSyncTabsInNigoriNode(encrypted_types);
+
+  ReadTransaction trans(FROM_HERE, sync_manager_.GetUserShare());
+  ReadNode node(&trans);
+  ASSERT_TRUE(node.InitByIdLookup(GetIdForDataType(syncable::NIGORI)));
+  EXPECT_FALSE(node.GetNigoriSpecifics().sync_tabs());
+}
+
+TEST_F(SyncManagerTest, SyncTabsInNigoriNode) {
+  syncable::ModelTypeSet encrypted_types;
+  encrypted_types.insert(syncable::SESSIONS);
+  sync_manager_.MaybeSetSyncTabsInNigoriNode(encrypted_types);
+
+  ReadTransaction trans(FROM_HERE, sync_manager_.GetUserShare());
+  ReadNode node(&trans);
+  ASSERT_TRUE(node.InitByIdLookup(GetIdForDataType(syncable::NIGORI)));
+  EXPECT_TRUE(node.GetNigoriSpecifics().sync_tabs());
+}
+
 TEST_F(SyncManagerTest, ProcessJsMessage) {
   const JsArgList kNoArgs;