add mole collapse/expand events. convert mappy to use this.

chrome/browser/extensions/extension_toolstrip_api.h

 // Copyright (c) 2009 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_EXTENSIONS_EXTENSION_TOOLSTRIP_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLSTRIP_API_H_
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/extensions/extension_shelf_model.h"
 
+class Profile;
+
 // Function names.
 namespace extension_toolstrip_api_functions {
   extern const char kExpandFunction[];
   extern const char kCollapseFunction[];
 };  // namespace extension_toolstrip_api_functions
 
+namespace extension_toolstrip_api_events {
+  extern const char kOnToolstripExpanded[];
+  extern const char kOnToolstripCollapsed[];
+};  // namespace extension_toolstrip_api_events
+
 class ToolstripFunction : public SyncExtensionFunction {
  protected:
   virtual bool RunImpl();
 
   ExtensionShelfModel* model_;
   ExtensionShelfModel::iterator toolstrip_;
 };
 
 class ToolstripExpandFunction : public ToolstripFunction {
   virtual bool RunImpl();
 };
 
 class ToolstripCollapseFunction : public ToolstripFunction {
   virtual bool RunImpl();
 };
 
+class ToolstripEventRouter {
+ public:
+  // Toolstrip events.
+  static void OnToolstripExpanded(Profile* profile,
+                                  int routing_id,
+                                  const GURL& url,
+                                  int height);
+  static void OnToolstripCollapsed(Profile* profile,
+                                   int routing_id,
+                                   const GURL& url);
+
+ private:
+  // Helper to actually dispatch an event to extension listeners.
+  static void DispatchEvent(Profile* profile,
+                            int routing_id,
+                            const char* event_name,
+                            const Value& json);
+
+  DISALLOW_COPY_AND_ASSIGN(ToolstripEventRouter);
+};
+
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TOOLSTRIP_API_H_