WIP add code to check http headers for origin trial tokens

content/common/origin_trials/trial_token_validator.cc

Index: content/common/origin_trials/trial_token_validator.cc
diff --git a/content/common/origin_trials/trial_token_validator.cc b/content/common/origin_trials/trial_token_validator.cc
index d9c210d4046278d487627576869de12d06c1b371..ed38734970f71eff848fccfc56379c324faeae1a 100644
--- a/content/common/origin_trials/trial_token_validator.cc
+++ b/content/common/origin_trials/trial_token_validator.cc
@@ -7,6 +7,8 @@
 #include "base/time/time.h"
 #include "content/common/origin_trials/trial_token.h"
 #include "content/public/common/content_client.h"
+#include "net/http/http_response_headers.h"
+#include "net/url_request/url_request.h"
 
 namespace content {
 
@@ -23,4 +25,17 @@ bool TrialTokenValidator::ValidateToken(const std::string& token,
          trial_token->IsValid(base::Time::Now(), public_key);
 }
 
+bool TrialTokenValidator::RequestEnablesFeature(const net::URLRequest* request,
+                                                base::StringPiece featureName) {
+  url::Origin origin(request->url());
+  size_t iter = 0;
+  std::string token;
+  while (request->response_headers()->EnumerateHeader(&iter, "Origin-Trial",
+                                                      &token)) {
+    if (ValidateToken(token, origin, featureName))
+      return true;
+  }
+  return false;
+}
+
 }  // namespace content