Make Foreign Fetch an origin trial.

content/browser/service_worker/link_header_support.cc

 // 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.
 
 #include "content/browser/service_worker/link_header_support.h"
 
 #include "base/command_line.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "components/link_header_util/link_header_util.h"
 #include "content/browser/loader/resource_message_filter.h"
 #include "content/browser/loader/resource_request_info_impl.h"
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
 #include "content/browser/service_worker/service_worker_request_handler.h"
+#include "content/common/origin_trials/trial_token_validator.h"
 #include "content/common/service_worker/service_worker_utils.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/origin_util.h"
 #include "net/http/http_util.h"
 #include "net/url_request/url_request.h"
 
 namespace content {
 
 namespace {
 
 void RegisterServiceWorkerFinished(int64_t trace_id, bool result) {
   TRACE_EVENT_ASYNC_END1("ServiceWorker",
                          "LinkHeaderResourceThrottle::HandleServiceWorkerLink",
                          trace_id, "Success", result);
 }
 
 void HandleServiceWorkerLink(
     const net::URLRequest* request,
     const std::string& url,
     const std::unordered_map<std::string, base::Optional<std::string>>& params,
     ServiceWorkerContextWrapper* service_worker_context_for_testing) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableExperimentalWebPlatformFeatures)) {
-    // TODO(mek): Integrate with experimental framework.
+          switches::kEnableExperimentalWebPlatformFeatures) &&
+      !TrialTokenValidator::RequestEnablesFeature(request, "ForeignFetch")) {
+    // TODO(mek): Log attempt to use without having correct token?
     return;
   }
 
   if (ContainsKey(params, "anchor"))
     return;
 
   const ResourceRequestInfoImpl* request_info =
       ResourceRequestInfoImpl::ForRequest(request);
   ResourceMessageFilter* filter = request_info->filter();
   ServiceWorkerContext* service_worker_context =
@@ skipping 99 matching lines @@
     const net::URLRequest* request,
     const std::string& link_header,
     ServiceWorkerContextWrapper* service_worker_context_for_testing) {
   for (const auto& value : link_header_util::SplitLinkHeader(link_header)) {
     ProcessLinkHeaderValueForRequest(request, value.first, value.second,
                                      service_worker_context_for_testing);
   }
 }
 
 }  // namespace content