[Sync] Gracefully handle writing to a node when the cryptographer is not ready.

chrome/browser/sync/engine/get_commit_ids_command.h

Index: chrome/browser/sync/engine/get_commit_ids_command.h
diff --git a/chrome/browser/sync/engine/get_commit_ids_command.h b/chrome/browser/sync/engine/get_commit_ids_command.h
index c730a643637be683e541dc5fa80a9602f8fb4f92..8c0bf9154f632d747fcd1de9e41fd1dd19b08f77 100644
--- a/chrome/browser/sync/engine/get_commit_ids_command.h
+++ b/chrome/browser/sync/engine/get_commit_ids_command.h
@@ -29,6 +29,13 @@ class GetCommitIdsCommand : public SyncerCommand {
   // SyncerCommand implementation.
   virtual void ExecuteImpl(sessions::SyncSession* session);
 
+  // Filter |unsynced_handles| to exclude all handles to entries that require
+  // encryption but are in plaintext.
+  static void FilterEntriesNeedingEncryption(
+      const syncable::ModelTypeSet& encrypted_types,
+      syncable::BaseTransaction* trans,
+      syncable::Directory::UnsyncedMetaHandles* unsynced_handles);
+
   // Builds a vector of IDs that should be committed.
   void BuildCommitIds(const vector<int64>& unsynced_handles,
                       syncable::WriteTransaction* write_transaction,