Define PushMessagingApplicationId and replace ad-hoc code.

chrome/browser/services/gcm/push_messaging_application_id.h

+// 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.
+
+#ifndef CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_APPLICATION_ID_H_
+#define CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_APPLICATION_ID_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "url/gurl.h"
+
+namespace gcm {
+
+// The prefix used for all push messaging application ids.
+extern const char kPushMessagingApplicationIdPrefix[];
+
+// Type used to identify a web app from a Push API perspective.
+struct PushMessagingApplicationId {
+ public:
+  static PushMessagingApplicationId Parse(const std::string& id);
+
+  PushMessagingApplicationId()
+      : origin(GURL::EmptyGURL()), service_worker_registration_id(-1) {}
+  PushMessagingApplicationId(const GURL& origin,
+                             int64 service_worker_registration_id)
+      : origin(origin),
+        service_worker_registration_id(service_worker_registration_id) {}
+
+  bool IsValid();
+  std::string ToString() const;
+
+  const GURL origin;
+  const int64 service_worker_registration_id;
+};
+
+}  // namespace gcm
+
+#endif  // CHROME_BROWSER_SERVICES_GCM_PUSH_MESSAGING_APPLICATION_ID_H_