Add a Dns preresolve interface in //content

content/browser/loader/resource_hints_impl.cc

Index: content/browser/loader/resource_hints_impl.cc
diff --git a/content/browser/loader/resource_hints_impl.cc b/content/browser/loader/resource_hints_impl.cc
index 694947881e67296fa2fa2d6ebdb829da9de7eedb..c9ca99fae8f3799890c34ea4834b1f6e7fd32702 100644
--- a/content/browser/loader/resource_hints_impl.cc
+++ b/content/browser/loader/resource_hints_impl.cc
@@ -2,9 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "content/public/browser/resource_hints.h"
-
+#include "base/memory/ptr_util.h"
+#include "content/browser/loader/resource_dispatcher_host_impl.h"
+#include "content/browser/loader/resource_hints_controller.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/resource_context.h"
+#include "content/public/browser/resource_hints.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_network_session.h"
 #include "net/http/http_request_info.h"
@@ -12,20 +15,19 @@
 #include "net/http/http_transaction_factory.h"
 #include "net/url_request/http_user_agent_settings.h"
 #include "net/url_request/url_request_context.h"
-#include "net/url_request/url_request_context_getter.h"
 
 namespace content {
 
-void PreconnectUrl(net::URLRequestContextGetter* getter,
+void PreconnectUrl(content::ResourceContext* resource_context,
                    const GURL& url,
                    const GURL& first_party_for_cookies,
                    int count,
                    bool allow_credentials,
                    net::HttpRequestInfo::RequestMotivation motivation) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
-  DCHECK(getter);
+  DCHECK(resource_context);
 
-  net::URLRequestContext* context = getter->GetURLRequestContext();
+  net::URLRequestContext* context = resource_context->GetRequestContext();
   net::HttpTransactionFactory* factory = context->http_transaction_factory();
   net::HttpNetworkSession* session = factory->GetSession();
 
@@ -57,4 +59,16 @@ void PreconnectUrl(net::URLRequestContextGetter* getter,
   http_stream_factory->PreconnectStreams(count, request_info);
 }
 
+int PreresolveUrl(content::ResourceContext* resource_context,
+                  const GURL& url,
+                  const net::CompletionCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  ResourceDispatcherHostImpl* dispatcher_host =
+      ResourceDispatcherHostImpl::Get();
+  DCHECK(dispatcher_host);
+  ResourceHintsController* controller =
+      dispatcher_host->resource_hints_controller();
+  return controller->PreresolveUrl(resource_context, url, callback);
+}
+
 }  // namespace content