Add GROUP_FILE ModelSafeGroup

chrome/browser/sync/glue/browser_thread_model_worker.cc

Index: chrome/browser/sync/glue/browser_thread_model_worker.cc
diff --git a/chrome/browser/sync/glue/browser_thread_model_worker.cc b/chrome/browser/sync/glue/browser_thread_model_worker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..49bdfb8b01176a08436e4522262e84667a007b8c
--- /dev/null
+++ b/chrome/browser/sync/glue/browser_thread_model_worker.cc
@@ -0,0 +1,52 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/sync/glue/browser_thread_model_worker.h"
+
+#include "base/synchronization/waitable_event.h"
+#include "content/browser/browser_thread.h"
+
+using base::WaitableEvent;
+
+namespace browser_sync {
+
+BrowserThreadModelWorker::BrowserThreadModelWorker(
+    BrowserThread::ID thread, ModelSafeGroup group)
+    : thread_(thread), group_(group) {}
+
+BrowserThreadModelWorker::~BrowserThreadModelWorker() {}
+
+void BrowserThreadModelWorker::DoWorkAndWaitUntilDone(Callback0::Type* work) {
+  if (BrowserThread::CurrentlyOn(thread_)) {
+    DLOG(WARNING) << "Already on thread " << thread_;
+    work->Run();
+    return;
+  }
+  WaitableEvent done(false, false);
+  if (!BrowserThread::PostTask(
+      thread_,
+      FROM_HERE,
+      NewRunnableMethod(
+          this,
+          &BrowserThreadModelWorker::CallDoWorkAndSignalTask,
+          work,
+          &done))) {
+    NOTREACHED() << "Failed to post task to thread " << thread_;
+    return;
+  }
+  done.Wait();
+}
+
+void BrowserThreadModelWorker::CallDoWorkAndSignalTask(
+    Callback0::Type* work, WaitableEvent* done) {
+  DCHECK(BrowserThread::CurrentlyOn(thread_));
+  work->Run();
+  done->Signal();
+}
+
+ModelSafeGroup BrowserThreadModelWorker::GetModelSafeGroup() {
+  return group_;
+}
+
+}  // namespace browser_sync