Add a NavigationThrottle to the public content/ interface

content/test/test_navigation_handle_factory.h

Index: content/test/test_navigation_handle_factory.h
diff --git a/content/test/test_navigation_handle_factory.h b/content/test/test_navigation_handle_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..3649df0d43b7792d26fd2c4edb9a61bf7be63aeb
--- /dev/null
+++ b/content/test/test_navigation_handle_factory.h
@@ -0,0 +1,36 @@
+// Copyright 2015 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_NAVIGATION_HANDLE_FACTORY_H_
+#define CONTENT_TEST_TEST_NAVIGATION_HANDLE_FACTORY_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "content/browser/frame_host/navigation_handle_factory.h"
+
+namespace content {
+
+// Manages creation of the NavigationHandles; when registered, all created
+// NavigationHandles will be TestNavigationHandles. This automatically
+// registers itself when it goes in scope, and unregisters itself when it goes
+// out of scope. Since you can't have more than one factory registered at a
+// time, you can only have one of these objects at a time.
+class TestNavigationHandleFactory : public NavigationHandleFactory {
+ public:
+  TestNavigationHandleFactory();
+  ~TestNavigationHandleFactory() override;
+
+  // NavigationHandleFactory implementation.
+  scoped_ptr<NavigationHandleImpl> CreateHandle(
+      const GURL& url,
+      const GURL& validated_url,
+      bool is_main_frame,
+      NavigatorDelegate* delegate) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestNavigationHandleFactory);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_TEST_TEST_NAVIGATION_HANDLE_FACTORY_H_