[Sync] Introduce GmsCoreSyncListener.

sync/test/fake_server/fake_server.cc

Index: sync/test/fake_server/fake_server.cc
diff --git a/sync/test/fake_server/fake_server.cc b/sync/test/fake_server/fake_server.cc
index 9a464578c3ca33d15bab81c8c819fd5aa89e775b..01f5a16f7b76875db6679d24e7e075a51aedd3b0 100644
--- a/sync/test/fake_server/fake_server.cc
+++ b/sync/test/fake_server/fake_server.cc
@@ -169,14 +169,18 @@ FakeServer::FakeServer() : version_(0),
                            request_counter_(0),
                            network_enabled_(true),
                            weak_ptr_factory_(this) {
+  Init();
+}
+
+FakeServer::~FakeServer() {}
+
+void FakeServer::Init() {
   keystore_keys_.push_back(kDefaultKeystoreKey);
 
   const bool create_result = CreateDefaultPermanentItems();
   DCHECK(create_result) << "Permanent items were not created successfully.";
 }
 
-FakeServer::~FakeServer() {}
-
 bool FakeServer::CreatePermanentBookmarkFolder(const std::string& server_tag,
                                                const std::string& name) {
   DCHECK(thread_checker_.CalledOnValidThread());
@@ -590,6 +594,7 @@ void FakeServer::ClearServerData() {
   entities_.clear();
   keystore_keys_.clear();
   ++store_birthday_;
+  Init();
 }
 
 void FakeServer::SetAuthenticated() {