[SyncFS] Clear dirty flag on changelist application phase

chrome/browser/sync_file_system/drive_backend/metadata_database_index_on_disk.cc

Index: chrome/browser/sync_file_system/drive_backend/metadata_database_index_on_disk.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/metadata_database_index_on_disk.cc b/chrome/browser/sync_file_system/drive_backend/metadata_database_index_on_disk.cc
index 6afa05c997c61a6ac1f37d8490dde9a9f6914ac2..38cb6ac2f5e8074922fd74836645a8927b0e49cd 100644
--- a/chrome/browser/sync_file_system/drive_backend/metadata_database_index_on_disk.cc
+++ b/chrome/browser/sync_file_system/drive_backend/metadata_database_index_on_disk.cc
@@ -494,6 +494,36 @@ int64 MetadataDatabaseIndexOnDisk::PickDirtyTracker() const {
   return tracker_id;
 }
 
+void MetadataDatabaseIndexOnDisk::EnumerateDirtyTrackers(
+    const TrackerIDCallback& callback) const {
+  scoped_ptr<LevelDBWrapper::Iterator> itr = db_->NewIterator();
+  for (itr->Seek(kDirtyIDKeyPrefix); itr->Valid(); itr->Next()) {
+    std::string id_str;
+    if (!RemovePrefix(itr->key().ToString(), kDirtyIDKeyPrefix, &id_str))
+      break;
+
+    int64 tracker_id = 0;
+    if (!base::StringToInt64(id_str, &tracker_id)) {
+      NOTREACHED();
+      continue;
+    }
+    callback.Run(tracker_id);
+  }
+
+  for (itr->Seek(kDemotedDirtyIDKeyPrefix); itr->Valid(); itr->Next()) {
+    std::string id_str;
+    if (!RemovePrefix(itr->key().ToString(), kDemotedDirtyIDKeyPrefix, &id_str))
+      break;
+
+    int64 tracker_id = 0;
+    if (!base::StringToInt64(id_str, &tracker_id)) {
+      NOTREACHED();
+      continue;
+    }
+    callback.Run(tracker_id);
+  }
+}
+
 void MetadataDatabaseIndexOnDisk::DemoteDirtyTracker(int64 tracker_id) {
   const std::string key = GenerateDirtyIDKey(tracker_id);