Add link preload as=document support

content/child/web_url_loader_impl.cc

 // Copyright 2014 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/child/web_url_loader_impl.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 24 matching lines @@
 #include "content/common/resource_request_body_impl.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "content/common/ssl_status_serialization.h"
 #include "content/common/url_loader.mojom.h"
 #include "content/public/child/fixed_received_data.h"
 #include "content/public/child/request_peer.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/ssl_status.h"
 #include "net/base/data_url.h"
 #include "net/base/filename_util.h"
+#include "net/base/load_flags.h"
 #include "net/base/net_errors.h"
 #include "net/cert/cert_status_flags.h"
 #include "net/cert/ct_sct_to_string.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_util.h"
 #include "net/ssl/ssl_cipher_suite_names.h"
 #include "net/ssl/ssl_connection_status_flags.h"
 #include "net/url_request/url_request_data_job.h"
 #include "third_party/WebKit/public/platform/WebHTTPLoadInfo.h"
 #include "third_party/WebKit/public/platform/WebSecurityOrigin.h"
@@ skipping 387 matching lines @@
         ConvertWebKitPriorityToNetPriority(new_priority),
         intra_priority_value);
   }
 }
 
 void WebURLLoaderImpl::Context::Start(const WebURLRequest& request,
                                       SyncLoadResponse* sync_load_response) {
   DCHECK(request_id_ == -1);
   request_ = request;  // Save the request.
   GURL url = request.url();
-
   if (CanHandleDataURLRequestLocally()) {
     if (sync_load_response) {
       // This is a sync load. Do the work now.
       sync_load_response->url = url;
       sync_load_response->error_code =
           GetInfoFromDataURL(sync_load_response->url, sync_load_response,
                              &sync_load_response->data);
     } else {
       task_runner_->PostTask(FROM_HERE,
                              base::Bind(&Context::HandleDataURL, this));
@@ skipping 29 matching lines @@
   request_info.method = method;
   request_info.url = url;
   request_info.first_party_for_cookies = request.firstPartyForCookies();
   request_info.request_initiator = request.requestorOrigin();
   referrer_policy_ = request.referrerPolicy();
   request_info.referrer = Referrer(referrer_url, referrer_policy_);
   request_info.headers = GetWebURLRequestHeaders(request);
   request_info.load_flags = GetLoadFlagsForWebURLRequest(request);
   request_info.enable_load_timing = true;
   request_info.enable_upload_progress = request.reportUploadProgress();
+  if (request_.linkPreload())
+      request_info.load_flags |= net::LOAD_PREFETCH;
+
   if (request.getRequestContext() ==
           WebURLRequest::RequestContextXMLHttpRequest &&
       (url.has_username() || url.has_password())) {
     request_info.do_not_prompt_for_login = true;
   }
   // requestor_pid only needs to be non-zero if the request originates outside
   // the render process, so we can use requestorProcessID even for requests
   // from in-process plugins.
   request_info.requestor_pid = request.requestorProcessID();
   request_info.request_type = WebURLRequestToResourceType(request);
@@ skipping 701 matching lines @@
     response->clearHTTPHeaderField(webStringName);
     while (response_headers->EnumerateHeader(&iterator, name, &value)) {
       response->addHTTPHeaderField(webStringName,
                                    WebString::fromLatin1(value));
     }
   }
   return true;
 }
 
 }  // namespace content