Cherry-picking hangouts.google.com whitelisting change into M52.

chrome/renderer/app_categorizer.h

Index: chrome/renderer/app_categorizer.h
diff --git a/chrome/renderer/app_categorizer.h b/chrome/renderer/app_categorizer.h
new file mode 100644
index 0000000000000000000000000000000000000000..744a8dc0e06a9d43168626d033f455656adb9e70
--- /dev/null
+++ b/chrome/renderer/app_categorizer.h
@@ -0,0 +1,16 @@
+// Copyright 2016 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 CHROME_RENDERER_APP_CATEGORIZER_H_
+#define CHROME_RENDERER_APP_CATEGORIZER_H_
+
+class GURL;
+
+class AppCategorizer {
+ public:
+  static bool IsHangoutsUrl(const GURL& url);
+  static bool IsWhitelistedApp(const GURL& manifest_url, const GURL& app_url);
+};
+
+#endif  // CHROME_RENDERER_APP_CATEGORIZER_H_