Adding a user list (to be consumed by GCM Client Implementation)

google_apis/gcm/engine/gcm_store.cc

Index: google_apis/gcm/engine/gcm_store.cc
diff --git a/google_apis/gcm/engine/gcm_store.cc b/google_apis/gcm/engine/gcm_store.cc
index b8559b09cfc9abf2b3b521daa923daf59edd591b..f6c81dda8958eee8d9b650a9eae7405cb41f269b 100644
--- a/google_apis/gcm/engine/gcm_store.cc
+++ b/google_apis/gcm/engine/gcm_store.cc
@@ -6,11 +6,18 @@
 
 namespace gcm {
 
+GCMStore::SerialNumberMappings::SerialNumberMappings()
+    : next_serial_number(1LL) {
+}
+
+GCMStore::SerialNumberMappings::~SerialNumberMappings() {
+}
+
 GCMStore::LoadResult::LoadResult()
     : success(false),
       device_android_id(0),
-      device_security_token(0),
-      next_serial_number(1LL) {}
+      device_security_token(0) {
+}
 
 GCMStore::LoadResult::~LoadResult() {}