Introduce AncestorThrottle, which will process 'X-Frame-Options' headers.

content/browser/frame_host/ancestor_throttle.h

Index: content/browser/frame_host/ancestor_throttle.h
diff --git a/content/browser/frame_host/ancestor_throttle.h b/content/browser/frame_host/ancestor_throttle.h
new file mode 100644
index 0000000000000000000000000000000000000000..efd8e86d15e22a7e9e5b39355d56b198b231d317
--- /dev/null
+++ b/content/browser/frame_host/ancestor_throttle.h
@@ -0,0 +1,63 @@
+// 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_BROWSER_SECURITY_ANCESTOR_THROTTLE_H_

[nasko, 2016/04/12 22:21:19]

Mismatched include guard and file path/name.

[Mike West, 2016/04/13 13:28:08]

Done, thanks!

[nasko, 2016/04/29 18:56:02]

Hmm, I must be getting really old. I don't see this being updated in PS6.

[Mike West, 2016/05/02 09:37:51]

Yeah. Sorry. I'm old too and forgot. :/

+#define CHROME_BROWSER_SECURITY_ANCESTOR_THROTTLE_H_
+
+#include <memory>
+
+#include "base/gtest_prod_util.h"
+#include "base/macros.h"
+#include "content/public/browser/navigation_throttle.h"
+
+namespace content {
+class NavigationHandle;
+}
+
+namespace net {
+class HttpResponseHeaders;
+}
+
+namespace content {
+
+// An AncestorThrottle is responsible for enforcing a resource's embedding
+// rules, and blocking requests which violate them.
+class CONTENT_EXPORT AncestorThrottle : public NavigationThrottle {
+ public:
+  enum HeaderDisposition {
+    NONE,
+    DENY,
+    SAMEORIGIN,
+    ALLOWALL,
+    INVALID,
+    CONFLICT
+  };
+
+  static std::unique_ptr<NavigationThrottle> MaybeCreateThrottleFor(
+      NavigationHandle* handle);
+
+  explicit AncestorThrottle(NavigationHandle* handle);
+  ~AncestorThrottle() override;
+
+  NavigationThrottle::ThrottleCheckResult WillProcessResponse() override;
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(AncestorThrottleTest, Parsing);
+  FRIEND_TEST_ALL_PREFIXES(AncestorThrottleTest, ParseErrors);
+
+  void ParseError(const std::string& value, HeaderDisposition disposition);
+  void ConsoleError(HeaderDisposition disposition);
+
+  // Parses an 'X-Frame-Options' header. If the result is either CONFLICT
+  // or INVALID, |header_value| will be populated with the value which caused
+  // the parse error.
+  HeaderDisposition ParseHeader(const net::HttpResponseHeaders* headers,
+                                std::string* header_value);
+
+  DISALLOW_COPY_AND_ASSIGN(AncestorThrottle);
+};
+
+}  // namespace content
+
+#endif  // CHROME_BROWSER_SECURITY_Ancestor_THROTTLE_H_