Implementation of subresource integrity attribute for secure origins.

Source/core/frame/SubresourceIntegrity.h

+// Copyright 2014 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 SubresourceIntegrity_h
+#define SubresourceIntegrity_h
+
+#include "platform/Crypto.h"
+
+namespace WTF {
+class String;
+};
+
+namespace blink {
+
+class Element;
+class KURL;
+
+class SubresourceIntegrity {
+public:
+    static bool CheckSubresourceIntegrity(const Element&, const WTF::String&, const KURL& resourceUrl);
+
+private:
+    // FIXME: After the merge with the Chromium repo, this should be refactored
+    // to use FRIEND_TEST in base/gtest_prod_util.h.
+    friend class SubresourceIntegrityTest_Parsing_Test;
+
+    static bool parseIntegrityAttribute(const WTF::String& attribute, WTF::String& integrity, HashAlgorithm&);
+};
+
+} // namespace blink
+
+#endif