Added classes to enable session sync functionality....

chrome/browser/sync/syncable/model_type.cc

Index: chrome/browser/sync/syncable/model_type.cc
===================================================================
--- chrome/browser/sync/syncable/model_type.cc	(revision 56023)
+++ chrome/browser/sync/syncable/model_type.cc	(working copy)
@@ -12,6 +12,7 @@
 #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/sync.pb.h"
 #include "chrome/browser/sync/protocol/theme_specifics.pb.h"
 #include "chrome/browser/sync/protocol/typed_url_specifics.pb.h"
@@ -45,6 +46,9 @@
     case NIGORI:
       specifics->MutableExtension(sync_pb::nigori);
       break;
+    case SESSIONS:
+      specifics->MutableExtension(sync_pb::session);
+      break;
     case APPS:
       specifics->MutableExtension(sync_pb::app);
       break;
@@ -112,6 +116,9 @@
   if (specifics.HasExtension(sync_pb::app))
     return APPS;
 
+  if (specifics.HasExtension(sync_pb::session))
+    return SESSIONS;
+
   return UNSPECIFIED;
 }
 
@@ -133,6 +140,8 @@
       return "Extensions";
     case NIGORI:
       return "Encryption keys";
+    case SESSIONS:
+      return "Sessions";
     case APPS:
       return "Apps";
     default:
@@ -153,6 +162,7 @@
 const char kExtensionNotificationType[] = "EXTENSION";
 const char kNigoriNotificationType[] = "NIGORI";
 const char kAppNotificationType[] = "APP";
+const char kSessionNotificationType[] = "SESSION";
 }  // namespace
 
 bool RealModelTypeToNotificationType(ModelType model_type,
@@ -185,6 +195,9 @@
     case APPS:
       *notification_type = kAppNotificationType;
       return true;
+    case SESSIONS:
+      *notification_type = kSessionNotificationType;
+      return true;
     default:
       break;
   }
@@ -221,6 +234,9 @@
   } else if (notification_type == kAppNotificationType) {
     *model_type = APPS;
     return true;
+  } else if (notification_type == kSessionNotificationType) {
+    *model_type = SESSIONS;
+    return true;
   }
   *model_type = UNSPECIFIED;
   return false;