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..c17bf3496f34288c0affa40e9a6434fe463f198d 100644
--- a/content/browser/appcache/appcache_dispatcher_host.h
+++ b/content/browser/appcache/appcache_dispatcher_host.h
@@ -38,6 +38,18 @@ 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);
+
+  // PlzNavigate: A pending host is registered when a navigation is initiated
+  // by the browser. The registration completes when the renderer sends the
+  // AppCacheHostMsg_RegisterHost message to us. This function should be called
+  // on the IO thread.
+  void RegisterPendingHost(int host);
+
   // IPC message handlers
   void OnRegisterHost(int host_id);
   void OnUnregisterHost(int host_id);
@@ -62,6 +74,10 @@ class AppCacheDispatcherHost : public BrowserMessageFilter {
   void StartUpdateCallback(bool result, void* param);
   void SwapCacheCallback(bool result, void* param);
 
+  // Returns the AppCacheDispatcherHost instance associated with the
+  // |process_id| passed in.
+  static scoped_refptr<AppCacheDispatcherHost> GetHostForProcess(
+      int process_id);
 
   scoped_refptr<ChromeAppCacheService> appcache_service_;
   AppCacheFrontendProxy frontend_proxy_;
@@ -75,6 +91,16 @@ class AppCacheDispatcherHost : public BrowserMessageFilter {
   // The corresponding ChildProcessHost object's id().
   int process_id_;
 
+  // PlzNavigate: Contains a list of pending hosts which have been registered
+  // via the RegisterPendingHost() function. The host is removed from the list
+  // when we receive the AppCacheHostMsg_RegisterHost IPC message.
+  std::set<int> pending_hosts_;
+
+  // PlzNavigate:
+  // This class needs to invoke functionality to register the precreated host
+  // with the AppCacheDispatcherHost.
+  friend class AppCacheNavigationHandleCore;
+
   base::WeakPtrFactory<AppCacheDispatcherHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheDispatcherHost);