PlzNavigate: AppCache support.

content/browser/appcache/appcache_backend_impl.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/appcache/appcache_backend_impl.h"
 
 #include "base/memory/ptr_util.h"
 #include "content/browser/appcache/appcache.h"
 #include "content/browser/appcache/appcache_group.h"
 #include "content/browser/appcache/appcache_service_impl.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/common/browser_side_navigation_policy.h"
 
 namespace content {
 
 AppCacheBackendImpl::AppCacheBackendImpl()
     : service_(NULL),
       frontend_(NULL),
       process_id_(0) {
 }
 
 AppCacheBackendImpl::~AppCacheBackendImpl() {
@@ skipping 138 matching lines @@
   auto found = hosts_.find(new_host_id);
   if (found == hosts_.end()) {
     NOTREACHED();
     return;
   }
 
   host->CompleteTransfer(new_host_id, frontend_);
   found->second = std::move(host);
 }
 
+void AppCacheBackendImpl::RegisterPrecreatedHost(
+    std::unique_ptr<AppCacheHost> host) {
+  DCHECK(IsBrowserSideNavigationEnabled());
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  DCHECK(host.get());
+  DCHECK(hosts_.find(host->host_id()) == hosts_.end());
+  // Switch the frontend proxy so that the host can make IPC calls from
+  // here on.
+  host->set_frontend(frontend_);
+  hosts_[host->host_id()] = std::move(host);
+}
+
 }  // namespace content