Upstream the Media Router's Issue class.

chrome/browser/media/router/issue.h

+// Copyright 2015 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_MEDIA_ROUTER_ISSUE_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_ISSUE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/logging.h"
+#include "chrome/browser/media/router/media_route.h"
+
+namespace media_router {
+
+using IssueId = std::string;

[DaleCurtis, 2015/04/30 18:18:14]

I'm wary of having this live outside of a class definition, you're defining
media_router::IssueId for everyone including this header. Is that what you want?

Also is it worth having a specialized IssueId type? It's just an std::string :)

[Kevin M, 2015/05/01 17:59:17]

Moved it into Issue.

Regarding specialized IssueIds: we decided to use aliases for IDs across the
Media Router codebase to make the function signatures self-documenting and to
allow for easier transitioning to other types such as structs down the line.

+
+// The text that corresponds with an action a user can take for a Issue.
+class IssueAction {
+ public:
+  enum Type { OK, CANCEL, DISMISS, LEARN_MORE };
+
+  explicit IssueAction(const Type type);
+  ~IssueAction();
+
+  Type type() const { return type_; }
+
+  bool Equals(const IssueAction& other) const { return type_ == other.type_; }
+
+ private:
+  Type type_;
+};
+
+// Contains the information relevant to an issue.
+class Issue {
+ public:
+  enum Severity { FATAL, WARNING, NOTIFICATION };
+
+  // Creates a custom issue.
+  // |title|: The title for the issue.
+  // |message|: The optional description message for the issue.
+  // |default_action|: Default action user can take to resolve the issue.
+  // |secondary_actions|: Array of options user can take to resolve the
+  //                      issue. Can be empty. Currently only one secondary
+  //                      action is supported.
+  // |route_id|: The route id, or empty if global.
+  // |severity|: The severity of the issue.
+  // |is_blocking|: True if the issue needs to be resolved before continuing.
+  // |help_url|: Required if one of the actions is learn-more.
+  Issue(const std::string& title,
+        const std::string& message,
+        const IssueAction& default_action,
+        const std::vector<IssueAction>& secondary_actions,
+        const MediaRouteId& route_id,
+        const Severity severity,
+        bool is_blocking,
+        const std::string& helpUrl);
+
+  ~Issue();
+
+  // See constructor comments for more information about these fields.
+  const std::string& title() const { return title_; }
+  const std::string& message() const { return message_; }
+  IssueAction default_action() const { return default_action_; }
+  const std::vector<IssueAction>& secondary_actions() const {
+    return secondary_actions_;
+  }
+  Severity severity() const { return severity_; }

[apacible, 2015/04/30 19:02:06]

nit: Can you put these in the same order as the parameters and member variables?

[Kevin M, 2015/05/01 17:59:17]

Done.

+  MediaRouteId route_id() const { return route_id_; }
+  const GURL& help_url() const { return help_url_; }
+
+  // Issue id.
+  const IssueId& id() const { return id_; }
+
+  // Whether or not this issue makes casting unable to function.
+  bool IsBlocking() const;

[DaleCurtis, 2015/04/30 18:18:15]

Seems like these should be hacker style too?

[apacible, 2015/04/30 19:02:06]

What does hacker style mean? 

[DaleCurtis, 2015/04/30 19:05:02]

hacker_style()

[Kevin M, 2015/05/01 17:59:17]

Done.

+
+  // Whether or not the issue is a global issue.
+  bool IsGlobal() const;
+
+  bool Equals(const Issue& other) const;
+
+ private:
+  const std::string title_;
+  const std::string message_;
+  const IssueAction default_action_;
+  const std::vector<IssueAction> secondary_actions_;
+  const std::string route_id_;
+  const Severity severity_;
+  const IssueId id_;
+  const bool is_blocking_;
+  const GURL help_url_;

[DaleCurtis, 2015/04/30 18:18:14]

Const values will prevent copyable classes. Is that intended? If so please add
DISALLOW_COPY_AND_ASSIGN() to each of these classes.

[Kevin M, 2015/05/01 17:59:17]

Done for this class.

Re: IssueAction, it needs to remain copyable and assignable for compatibility
with STL containers, so in that case I left the implicit ctors intact.

+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_ISSUE_H_