Adding Embedding-CSP HTTP header

third_party/WebKit/Source/core/html/HTMLIFrameElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann (hausmann@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2006, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Ericsson AB. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 103 matching lines @@
             SecurityPolicy::referrerPolicyFromStringWithLegacyKeywords(value, &m_referrerPolicy);
     } else if (name == allowfullscreenAttr) {
         bool oldAllowFullscreen = m_allowFullscreen;
         m_allowFullscreen = !value.isNull();
         if (m_allowFullscreen != oldAllowFullscreen)
             frameOwnerPropertiesChanged();
     } else if (name == permissionsAttr) {
         if (initializePermissionsAttribute())
             m_permissions->setValue(value);
     } else if (RuntimeEnabledFeatures::embedderCSPEnforcementEnabled() && name == cspAttr) {
+        if (!value.getString().containsOnlyASCII()) {
+            document().addConsoleMessage(ConsoleMessage::create(OtherMessageSource, ErrorMessageLevel, "'csp' attribute contains non-ASCII characters: " + value));

[Mike West, 2016/09/30 13:11:49]

This has the side-effect of putting `m_csp` and the attribute's value out of
sync. I'd suggest we clear out `m_csp` if the content attribute is invalid (and
update the spec accordingly).

+            return;
+        }
         AtomicString oldCSP = m_csp;
         m_csp = value;
         if (m_csp != oldCSP)
             frameOwnerPropertiesChanged();
     } else {
         if (name == srcAttr)
             logUpdateAttributeIfIsolatedWorldAndInDocument("iframe", srcAttr, oldValue, value);
         HTMLFrameElementBase::parseAttribute(name, oldValue, value);
     }
 }
@@ skipping 60 matching lines @@
 {
     if (!RuntimeEnabledFeatures::permissionDelegationEnabled())
         return false;
 
     if (!m_permissions)
         m_permissions = HTMLIFrameElementPermissions::create(this);
     return true;
 }
 
 } // namespace blink