[GCM] Move registration info persistence from extension state store to GCM store

google_apis/gcm/engine/registration_info.cc

Index: google_apis/gcm/engine/registration_info.cc
diff --git a/google_apis/gcm/engine/registration_info.cc b/google_apis/gcm/engine/registration_info.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6a41c76e00e2fdeb42f62bcd63b574d848fa942e
--- /dev/null
+++ b/google_apis/gcm/engine/registration_info.cc
@@ -0,0 +1,62 @@
+// Copyright 2014 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 "google_apis/gcm/engine/registration_info.h"
+
+#include "base/strings/string_util.h"
+
+namespace gcm {
+
+RegistrationInfo::RegistrationInfo() {
+}
+
+RegistrationInfo::~RegistrationInfo() {
+}
+
+std::string RegistrationInfo::SerializeAsString() const {
+  if (sender_ids.empty() || registration_id.empty())
+    return std::string();
+
+  // Serialize as:
+  //    sender1,sender2,...=reg_id
+  std::string value;
+  for (std::vector<std::string>::const_iterator iter = sender_ids.begin();
+       iter != sender_ids.end(); ++iter) {
+    DCHECK(!iter->empty() &&
+           iter->find(',') == std::string::npos &&
+           iter->find('=') == std::string::npos);
+    if (!value.empty())
+      value += ",";
+    value += *iter;
+  }
+
+  DCHECK(registration_id.find('=') == std::string::npos);
+  value += '=';
+  value += registration_id;
+  return value;
+}
+
+bool RegistrationInfo::ParseFromString(const std::string& value) {
+  if (value.empty())
+    return true;
+
+  size_t pos = value.find('=');
+  if (pos == std::string::npos)
+    return false;
+
+  std::string senders = value.substr(0, pos);
+  registration_id = value.substr(pos + 1);
+
+  Tokenize(senders, ",", &sender_ids);
+
+  if (sender_ids.empty() || registration_id.empty()) {
+    sender_ids.clear();
+    registration_id.clear();
+    return false;
+  }
+
+  return true;
+}
+
+}  // namespace gcm