Introduce the plumbing necessary to report Unrecoverable error from model safe workers.

chrome/browser/sync/sessions/sync_session.cc

Index: chrome/browser/sync/sessions/sync_session.cc
diff --git a/chrome/browser/sync/sessions/sync_session.cc b/chrome/browser/sync/sessions/sync_session.cc
index f399d7d7904ed1fee8a5425a8641cfaaab04675e..492abc1e796a9b8ddc53e60c58a609b9881d9a70 100644
--- a/chrome/browser/sync/sessions/sync_session.cc
+++ b/chrome/browser/sync/sessions/sync_session.cc
@@ -9,6 +9,8 @@
 #include "chrome/browser/sync/syncable/directory_manager.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
+
+#include "chrome/browser/sync/sessions/unrecoverable_error_info.cc"
 namespace browser_sync {
 namespace sessions {
 
@@ -21,7 +23,8 @@ SyncSession::SyncSession(SyncSessionContext* context, Delegate* delegate,
       write_transaction_(NULL),
       delegate_(delegate),
       workers_(workers),
-      routing_info_(routing_info) {
+      routing_info_(routing_info),
+      unrecoverable_error_(false) {
   status_controller_.reset(new StatusController(routing_info_));
   std::sort(workers_.begin(), workers_.end());
 }
@@ -133,6 +136,18 @@ SyncSourceInfo SyncSession::TestAndSetSource() {
   return old_source;
 }
 
+void SyncSession::SetUnrecoverableError(
+    const tracked_objects::Location& location,
+    const std::string& message,
+    syncable::BaseTransaction* trans) {
+  unrecoverable_error_ = true;
+  unrecoverable_error_info_.reset(new UnrecoverableErrorInfo(location,
+      message));
+  // If a transaction if provided then make sure it does not check tree
+  // invariants. We know it is corrupted.
+  trans->set_unrecoverable_error();
+}
+
 bool SyncSession::HasMoreToSync() const {
   const StatusController* status = status_controller_.get();
   return ((status->commit_ids().size() < status->unsynced_handles().size()) &&