PlzNavigate: AppCache support.

content/browser/appcache/appcache_backend_impl.h

Index: content/browser/appcache/appcache_backend_impl.h
diff --git a/content/browser/appcache/appcache_backend_impl.h b/content/browser/appcache/appcache_backend_impl.h
index e7f9b84eb288987c13a37f758f7c0273c6a08d51..da31e226c5f9a6293803d9577b6951c559133212 100644
--- a/content/browser/appcache/appcache_backend_impl.h
+++ b/content/browser/appcache/appcache_backend_impl.h
@@ -6,6 +6,7 @@
 #define CONTENT_BROWSER_APPCACHE_APPCACHE_BACKEND_IMPL_H_
 
 #include <stdint.h>
+#include <set>
 
 #include "base/containers/hash_tables.h"
 #include "content/browser/appcache/appcache_host.h"
@@ -66,12 +67,23 @@ class CONTENT_EXPORT AppCacheBackendImpl {
   std::unique_ptr<AppCacheHost> TransferHostOut(int host_id);
   void TransferHostIn(int new_host_id, std::unique_ptr<AppCacheHost> host);
 
+  // PlzNaviate
+  // 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);
+
  private:
   AppCacheServiceImpl* service_;
   AppCacheFrontend* frontend_;
   int process_id_;
   HostMap hosts_;
 
+  // PlzNavigate: Contains a list of pending hosts which have been registered
+  // via the RegisterPendingHost() function. The host is removed from the list
+  // when the RegisterHost() function is called.
+  std::set<int> pending_hosts_;
+
   DISALLOW_COPY_AND_ASSIGN(AppCacheBackendImpl);
 };