Populate versions on individual nodes in sync model and native bookmark model.

Update transaction versions of changed sync models and entries in
syncable::WriteTransaction after change delegate calculates changes and returns
handles of changed entries. For syncer changes, updated version is passed to
change processor and set on native model and nodes. For sync API changes, model
processor queries for new version and set on native model and nodes after write
transaction closes. 

BUG=154858


Review URL: https://chromiumcodereview.appspot.com/11341048

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@167061 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 7 insertions, 1 deletions

diff --git a/sync/internal_api/public/write_transaction.h b/sync/internal_api/public/write_transaction.h
index df27cad..8c11570 100644
--- a/sync/internal_api/public/write_transaction.h
+++ b/sync/internal_api/public/write_transaction.h
@@ -30,6 +30,12 @@ class WriteTransaction : public BaseTransaction {
   // Start a new read/write transaction.
   WriteTransaction(const tracked_objects::Location& from_here,
                    UserShare* share);
+  // |transaction_version| stores updated model and nodes version if model
+  // is changed by the transaction, or syncer::syncable::kInvalidTransaction
+  // if not after transaction is closed. This constructor is used for model
+  // types that support embassy data.
+  WriteTransaction(const tracked_objects::Location& from_here,
+                   UserShare* share, int64* transaction_version);
   virtual ~WriteTransaction();
 
   // Provide access to the syncable transaction from the API WriteNode.
@@ -40,7 +46,7 @@ class WriteTransaction : public BaseTransaction {
   WriteTransaction() {}
 
   void SetTransaction(syncable::WriteTransaction* trans) {
-      transaction_ = trans;
+    transaction_ = trans;
   }
 
  private: