Split BrowserThread into public API and private implementation, step 1.

content/test/test_browser_thread.h

Index: content/test/test_browser_thread.h
diff --git a/content/test/test_browser_thread.h b/content/test/test_browser_thread.h
new file mode 100644
index 0000000000000000000000000000000000000000..1067f9e8357925d4c31c11b3e584d2093ba1b88c
--- /dev/null
+++ b/content/test/test_browser_thread.h
@@ -0,0 +1,24 @@
+// 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.
+
+#ifndef CONTENT_TEST_TEST_BROWSER_BROWSER_THREAD_H_
+#define CONTENT_TEST_TEST_BROWSER_BROWSER_THREAD_H_
+#pragma once
+
+#include "content/browser/browser_thread_impl.h"
+
+namespace content {
+
+// A BrowserThread for unit tests; this lets unit tests in chrome/
+// create BrowserThread instances.
+class TestBrowserThread : public BrowserThreadImpl {
+ public:
+  explicit TestBrowserThread(ID identifier);
+  TestBrowserThread(ID identifier, MessageLoop* message_loop);
+  virtual ~TestBrowserThread();
+};
+
+}  // namespace content
+
+#endif  // CONTENT_TEST_TEST_BROWSER_BROWSER_THREAD_H_