Get main frame and subframe AppCache loads to work.

content/browser/loader/navigation_url_loader_network_service.cc

Index: content/browser/loader/navigation_url_loader_network_service.cc
diff --git a/content/browser/loader/navigation_url_loader_network_service.cc b/content/browser/loader/navigation_url_loader_network_service.cc
index f484182c77a6da1dc5bcdbfd8f230265fb458370..c3d6815ac0e209e97e0c3950b74fd76bc24d165d 100644
--- a/content/browser/loader/navigation_url_loader_network_service.cc
+++ b/content/browser/loader/navigation_url_loader_network_service.cc
@@ -9,6 +9,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
 #include "content/browser/appcache/appcache_navigation_handle.h"
+#include "content/browser/appcache/appcache_url_loader_factory.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigation_request_info.h"
@@ -129,7 +130,11 @@ class NavigationURLLoaderNetworkService::URLLoaderRequestController {
     }
 
     if (appcache_handle_core) {
-      // TODO: add appcache code here.
+      std::unique_ptr<URLLoaderRequestHandler> appcache_handler =
+          AppCacheURLLoaderFactory::CreateRequestHandler(
+              appcache_handle_core, url_loader_factory_getter.get());
+      if (appcache_handler)
+        handlers_.push_back(std::move(appcache_handler));
     }
 
     DCHECK(!network_factory_);