Add a Dns preresolve interface in //content

content/browser/loader/resource_dispatcher_host_impl.h

 // Copyright (c) 2012 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.
 
 // This is the browser side of the resource dispatcher, it receives requests
 // from the child process (i.e. [Renderer, Plugin, Worker]ProcessHost), and
 // dispatches them to URLRequests. It then forwards the messages from the
 // URLRequests back to the correct process for handling.
 //
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
@@ skipping 51 matching lines @@
 
 namespace content {
 class AppCacheService;
 class AsyncRevalidationManager;
 class CertStore;
 class FrameTree;
 class NavigationURLLoaderImplCore;
 class RenderFrameHostImpl;
 class ResourceContext;
 class ResourceDispatcherHostDelegate;
+class ResourceHintsController;
 class ResourceMessageDelegate;
 class ResourceMessageFilter;
 class ResourceRequestInfoImpl;
 class SaveFileManager;
 class ServiceWorkerNavigationHandleCore;
 class WebContentsImpl;
 struct CommonNavigationParams;
 struct DownloadSaveInfo;
 struct NavigationRequestInfo;
 struct Referrer;
@@ skipping 229 matching lines @@
   void BeginNavigationRequest(
       ResourceContext* resource_context,
       const NavigationRequestInfo& info,
       NavigationURLLoaderImplCore* loader,
       ServiceWorkerNavigationHandleCore* service_worker_handle_core);
 
   // Turns on stale-while-revalidate support, regardless of command-line flags
   // or experiment status. For unit tests only.
   void EnableStaleWhileRevalidateForTesting();
 
+  ResourceHintsController* resource_hints_controller() {
+    return resource_hints_controller_.get();
+  }
+
  private:
   friend class LoaderIOThreadNotifier;
   friend class ResourceDispatcherHostTest;
 
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            TestBlockedRequestsProcessDies);
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            CalculateApproximateMemoryCost);
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            DetachableResourceTimesOut);
@@ skipping 321 matching lines @@
   // http://crbug.com/90971 - Assists in tracking down use-after-frees on
   // shutdown.
   std::set<const ResourceContext*> active_resource_contexts_;
 
   typedef std::map<GlobalRequestID,
                    base::ObserverList<ResourceMessageDelegate>*> DelegateMap;
   DelegateMap delegate_map_;
 
   std::unique_ptr<ResourceScheduler> scheduler_;
 
+  std::unique_ptr<ResourceHintsController> resource_hints_controller_;
+
   // Allows tests to use a mock CertStore. If set, the CertStore must
   // outlive this ResourceDispatcherHostImpl.
   CertStore* cert_store_for_testing_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_RESOURCE_DISPATCHER_HOST_IMPL_H_