Discard pinning an app with non-empty launcher id.

chrome/browser/ui/ash/app_launcher_id.h

+// Copyright 2017 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_UI_ASH_APP_LAUNCHER_ID_H_
+#define CHROME_BROWSER_UI_ASH_APP_LAUNCHER_ID_H_
+
+#include <string>
+
+namespace ash {
+namespace launcher {
+
+// A unique chrome launcher id used to identify a shelf item. This class is a
+// wrapper for the chrome launcher identifier. |app_launcher_id_| includes the
+// |app_id| and the |launch_id|. The |app_id| is the application id associated
+// with a set of windows. The |launch_id| is an id that can be passed to an app
+// when launched in order to support multiple shelf items per app. This id is
+// used together with the |app_id| to uniquely identify each shelf item that
+// has the same |app_id|. The |app_id| must not be empty.
+class AppLauncherId {
+ public:
+  AppLauncherId(const std::string& app_id, const std::string& launch_id);
+  // Creates an AppLauncherId with an empty |launch_id|.
+  explicit AppLauncherId(const std::string& app_id);
+  // Empty constructor for pre-allocating.
+  AppLauncherId();
+  ~AppLauncherId();
+
+  AppLauncherId(const AppLauncherId& app_launcher_id) = default;
+  AppLauncherId(AppLauncherId&& app_launcher_id) = default;
+  AppLauncherId& operator=(const AppLauncherId& other) = default;
+
+  const std::string& app_id() const { return app_id_; }
+  const std::string& launch_id() const { return launch_id_; }
+
+ private:
+  // The application id associated with a set of windows.
+  std::string app_id_;
+  // An id that can be passed to an app when launched in order to support
+  // multiple shelf items per app.
+  std::string launch_id_;
+};
+
+}  // namespace launcher
+}  // namespace ash
+
+#endif  // CHROME_BROWSER_UI_ASH_APP_LAUNCHER_ID_H_