PlzNavigate: AppCache support.

content/browser/appcache/appcache_dispatcher_host.h

Index: content/browser/appcache/appcache_dispatcher_host.h
diff --git a/content/browser/appcache/appcache_dispatcher_host.h b/content/browser/appcache/appcache_dispatcher_host.h
index 9b882c8a97e706e4bf6723e15ff1b5dd35dae5b6..2238ee55dc5025695ce36d113ff2fa6afd6db0e0 100644
--- a/content/browser/appcache/appcache_dispatcher_host.h
+++ b/content/browser/appcache/appcache_dispatcher_host.h
@@ -38,6 +38,12 @@ class AppCacheDispatcherHost : public BrowserMessageFilter {
   ~AppCacheDispatcherHost() override;
 
  private:
+  // PlzNavigate:
+  // The AppCacheHost is precreated by the AppCacheNavigationHandleCore class
+  // when a navigation is initiated. We register the host with the backend in
+  // this function and ignore registrations for this host id from the renderer.
+  void RegisterPrecreatedHost(std::unique_ptr<AppCacheHost> host);
+
   // IPC message handlers
   void OnRegisterHost(int host_id);
   void OnUnregisterHost(int host_id);
@@ -62,7 +68,6 @@ class AppCacheDispatcherHost : public BrowserMessageFilter {
   void StartUpdateCallback(bool result, void* param);
   void SwapCacheCallback(bool result, void* param);
 
-
   scoped_refptr<ChromeAppCacheService> appcache_service_;
   AppCacheFrontendProxy frontend_proxy_;
   AppCacheBackendImpl backend_impl_;