CSP: group policies in didAddContentSecurityPolicy.

content/common/content_security_policy_header.h

 // 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 CONTENT_COMMON_CONTENT_SECURITY_POLICY_HEADER_
 #define CONTENT_COMMON_CONTENT_SECURITY_POLICY_HEADER_
 
 #include <string>
+
+#include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebContentSecurityPolicy.h"
 
 namespace content {
 
 // Represents a single Content Security Policy header (i.e. coming from
 // a single Content-Security-Policy header in an HTTP response, or from
 // a single <meta http-equiv="Content-Security-Policy"...> element).
-struct ContentSecurityPolicyHeader {
+struct CONTENT_EXPORT ContentSecurityPolicyHeader {
+  ContentSecurityPolicyHeader();
+  ContentSecurityPolicyHeader(const std::string& header_value,
+                              blink::WebContentSecurityPolicyType type,
+                              blink::WebContentSecurityPolicySource source);
+
   std::string header_value;
   blink::WebContentSecurityPolicyType type;
   blink::WebContentSecurityPolicySource source;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_CONTENT_SECURITY_POLICY_HEADER_