Initial implementation of status tray functionality (mac-only, currently).

chrome/browser/status_icons/status_tray.h

Index: chrome/browser/status_icons/status_tray.h
diff --git a/chrome/browser/status_icons/status_tray.h b/chrome/browser/status_icons/status_tray.h
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+// Copyright (c) 2010 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_STATUS_ICONS_STATUS_TRAY_H_
+#define CHROME_BROWSER_STATUS_ICONS_STATUS_TRAY_H_
+
+#include "base/hash_tables.h"
+#include "base/scoped_ptr.h"
+
+class StatusIcon;
+
+// Factory interface for creating icons to improve testability.
+class StatusIconFactory {
+ public:
+  virtual StatusIcon* CreateIcon() = 0;
+  virtual ~StatusIconFactory() { }
+};
+
+// Provides a cross-platform interface to the system's status tray, and exposes
+// APIs to add/remove icons to the tray and attach context menus.
+class StatusTray {
+ public:
+  // Takes ownership of |factory|.
+  explicit StatusTray(StatusIconFactory* factory);
+  ~StatusTray();
+
+  // Gets the current status icon associated with this identifier, or creates
+  // a new one if none exists. The StatusTray retains ownership of the
+  // StatusIcon. Returns NULL if the status tray icon could not be created.
+  StatusIcon* GetStatusIcon(const string16& identifier);
+
+  // Removes the current status icon associated with this identifier, if any.
+  void RemoveStatusIcon(const string16& identifier);
+
+ private:
+  typedef base::hash_map<string16, StatusIcon*> StatusIconMap;
+  // Map containing all active StatusIcons.
+  // Key: String identifiers (passed in to GetStatusIcon)
+  // Value: The StatusIcon associated with that identifier (strong pointer -
+  //   StatusIcons are freed when the StatusTray destructor is called).
+  StatusIconMap status_icons_;
+
+  scoped_ptr<StatusIconFactory> factory_;
+};
+
+#endif  // CHROME_BROWSER_STATUS_ICONS_STATUS_TRAY_H_