PlzNavigate: AppCache support.

content/browser/appcache/appcache_backend_impl.cc

Index: content/browser/appcache/appcache_backend_impl.cc
diff --git a/content/browser/appcache/appcache_backend_impl.cc b/content/browser/appcache/appcache_backend_impl.cc
index 7f29c3e97a713cb7a13924b6cc27a7fb9113627a..c07951504d1c8d7d0773a24e20f28ad11374846c 100644
--- a/content/browser/appcache/appcache_backend_impl.cc
+++ b/content/browser/appcache/appcache_backend_impl.cc
@@ -8,6 +8,8 @@
 #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 {
 
@@ -166,4 +168,17 @@ void AppCacheBackendImpl::TransferHostIn(int new_host_id,
   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