Added classes to enable session sync functionality.

chrome/browser/sync/engine/syncapi.cc

Index: chrome/browser/sync/engine/syncapi.cc
diff --git a/chrome/browser/sync/engine/syncapi.cc b/chrome/browser/sync/engine/syncapi.cc
index e53db9c18225448c5f9ea6e20547ef9c033ed54d..b31b3107f7df67dd1b8171b24a3a71ae0283e290 100644
--- a/chrome/browser/sync/engine/syncapi.cc
+++ b/chrome/browser/sync/engine/syncapi.cc
@@ -40,6 +40,7 @@
 #include "chrome/browser/sync/protocol/nigori_specifics.pb.h"
 #include "chrome/browser/sync/protocol/password_specifics.pb.h"
 #include "chrome/browser/sync/protocol/preference_specifics.pb.h"
+#include "chrome/browser/sync/protocol/session_specifics.pb.h"
 #include "chrome/browser/sync/protocol/service_constants.h"
 #include "chrome/browser/sync/protocol/sync.pb.h"
 #include "chrome/browser/sync/protocol/theme_specifics.pb.h"
@@ -299,6 +300,11 @@ const sync_pb::ExtensionSpecifics& BaseNode::GetExtensionSpecifics() const {
   return GetEntry()->Get(SPECIFICS).GetExtension(sync_pb::extension);
 }
 
+const sync_pb::SessionSpecifics& BaseNode::GetSessionSpecifics() const {
+  DCHECK(GetModelType() == syncable::SESSIONS);
+  return GetEntry()->Get(SPECIFICS).GetExtension(sync_pb::session);
+}
+
 syncable::ModelType BaseNode::GetModelType() const {
   return GetEntry()->GetModelType();
 }
@@ -403,6 +409,14 @@ void WriteNode::SetThemeSpecifics(
   PutThemeSpecificsAndMarkForSyncing(new_value);
 }
 
+
+void WriteNode::SetSessionSpecifics(
+    const sync_pb::SessionSpecifics& new_value) {
+  DCHECK(GetModelType() == syncable::SESSIONS);
+  PutSessionSpecificsAndMarkForSyncing(new_value);
+}
+
+
 void WriteNode::PutPasswordSpecificsAndMarkForSyncing(
     const sync_pb::PasswordSpecifics& new_value) {
   sync_pb::EntitySpecifics entity_specifics;
@@ -457,6 +471,15 @@ void WriteNode::PutExtensionSpecificsAndMarkForSyncing(
   PutSpecificsAndMarkForSyncing(entity_specifics);
 }
 
+
+void WriteNode::PutSessionSpecificsAndMarkForSyncing(
+    const sync_pb::SessionSpecifics& new_value) {
+  sync_pb::EntitySpecifics entity_specifics;
+  entity_specifics.MutableExtension(sync_pb::session)->CopyFrom(new_value);
+  PutSpecificsAndMarkForSyncing(entity_specifics);
+}
+
+
 void WriteNode::PutSpecificsAndMarkForSyncing(
     const sync_pb::EntitySpecifics& specifics) {
   // Skip redundant changes.
@@ -1881,7 +1904,6 @@ void SyncManager::SyncInternal::HandleChannelEvent(const SyncerEvent& event) {
   // Notifications are sent at the end of every sync cycle, regardless of
   // whether we should sync again.
   if (event.what_happened == SyncerEvent::SYNC_CYCLE_ENDED) {
-
     ModelSafeRoutingInfo enabled_types;
     registrar_->GetModelSafeRoutingInfo(&enabled_types);
     if (enabled_types.count(syncable::PASSWORDS) > 0) {