Provide skeleton functionality for AppCache handling in the network service.

content/browser/appcache/appcache_request_handler.h

Index: content/browser/appcache/appcache_request_handler.h
diff --git a/content/browser/appcache/appcache_request_handler.h b/content/browser/appcache/appcache_request_handler.h
index 3b7e16736d50b3198620f2e4367daa3bce0686e3..0e3450f2881ffc61b1fc61c5c23a1ec07b468300 100644
--- a/content/browser/appcache/appcache_request_handler.h
+++ b/content/browser/appcache/appcache_request_handler.h
@@ -17,6 +17,7 @@
 #include "content/browser/appcache/appcache_host.h"
 #include "content/browser/appcache/appcache_service_impl.h"
 #include "content/common/content_export.h"
+#include "content/common/url_loader_factory.mojom.h"
 #include "content/public/common/resource_type.h"
 
 namespace net {
@@ -26,9 +27,11 @@ class URLRequest;
 
 namespace content {
 class AppCacheJob;
+class AppCacheNavigationHandleCore;
 class AppCacheRequest;
 class AppCacheRequestHandlerTest;
 class AppCacheURLRequestJob;
+class ResourceContext;
 
 // An instance is created for each net::URLRequest. The instance survives all
 // http transactions involved in the processing of its net::URLRequest, and is
@@ -69,6 +72,20 @@ class CONTENT_EXPORT AppCacheRequestHandler
            type == RESOURCE_TYPE_SHARED_WORKER;
   }
 
+  // PlzNavigate and --enable-network-service.
+  // Checks whether the |resource_request| can be served out of the AppCache
+  // and invokes the |callback| accordingly. If the request can be served
+  // out of the AppCache, we could return a URLLoaderFactory which can serve
+  // requests out of the AppCache to the callback, or we could create the
+  // loader right there. At this point we are leaning towards the latter.
+  static void InitializeForNavigationNetworkService(
+      std::unique_ptr<ResourceRequest> resource_request,
+      ResourceContext* resource_context,
+      AppCacheNavigationHandleCore* navigation_handle_core,
+      ResourceType resource_type,
+      base::Callback<void(mojom::URLLoaderFactoryPtrInfo,
+                          std::unique_ptr<ResourceRequest>)> callback);
+
  private:
   friend class AppCacheHost;