WIP add code to check http headers for origin trial tokens

content/common/origin_trials/trial_token_validator.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_ORIGIN_TRIALS_TRIAL_TOKEN_VALIDATOR_H_
 #define CONTENT_COMMON_ORIGIN_TRIALS_TRIAL_TOKEN_VALIDATOR_H_
 
 #include <string>
 #include "base/strings/string_piece.h"
 #include "content/common/content_export.h"
 #include "url/origin.h"
 
+namespace net {
+class URLRequest;
+}
+
 namespace content {
 
 namespace TrialTokenValidator {
 
 // This method is thread-safe.
 CONTENT_EXPORT bool ValidateToken(const std::string& token,
                                   const url::Origin& origin,
                                   base::StringPiece featureName);
 
+CONTENT_EXPORT bool RequestEnablesFeature(const net::URLRequest* request,
+                                          base::StringPiece featureName);
+
 }  // namespace TrialTokenValidator
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_ORIGIN_TRIALS_TRIAL_TOKEN_VALIDATOR_H_