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

chrome/browser/extensions/extension_toolstrip_api.h

Index: chrome/browser/extensions/extension_toolstrip_api.h
diff --git a/chrome/browser/extensions/extension_toolstrip_api.h b/chrome/browser/extensions/extension_toolstrip_api.h
index 127c952f56f9d215df9937a91623569366cfcc5a..a21e627ac08fa337c2c4ebb5bc98cd660766a58c 100644
--- a/chrome/browser/extensions/extension_toolstrip_api.h
+++ b/chrome/browser/extensions/extension_toolstrip_api.h
@@ -8,12 +8,19 @@
 #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();
@@ -30,4 +37,25 @@ 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_