Add a histogram for tracking web store promo

chrome/browser/dom_ui/app_launcher_handler.h

Index: chrome/browser/dom_ui/app_launcher_handler.h
diff --git a/chrome/browser/dom_ui/app_launcher_handler.h b/chrome/browser/dom_ui/app_launcher_handler.h
index 5a3478ecb88cea16a92e40c4ba8692ed875e9ca5..ee20c106abce273e8705e8c70093955066161cc8 100644
--- a/chrome/browser/dom_ui/app_launcher_handler.h
+++ b/chrome/browser/dom_ui/app_launcher_handler.h
@@ -64,6 +64,9 @@ class AppLauncherHandler
   // Callback for the "hideAppPromo" message.
   void HandleHideAppsPromo(const ListValue* args);
 
+  // Callback for pings related to launching apps on the NTP.
+  static bool HandlePing(const std::string& path);

[Aaron Boodman, 2010/11/12 19:01:02]

We seem to usually put the statics methods together at the top of the method
list in Chromium code (just after the constructor and destructor). Can you fix
CreateAppInfo too?

+
  private:
   // ExtensionInstallUI::Delegate implementation, used for receiving
   // notification about uninstall confirmation dialog selections.
@@ -77,6 +80,14 @@ class AppLauncherHandler
   // Starts the animation of the app icon.
   void AnimateAppIcon(const Extension* extension, const gfx::Rect& rect);
 
+  // Records a web store launch in the appropriate histograms. |promo_active|
+  // specifies if the web store promotion was active.
+  static void RecordWebStoreLaunch(bool promo_active);

[Aaron Boodman, 2010/11/12 19:01:02]

Same here.

+
+  // Records an app launch in the appropriate histograms. |promo_active|
+  // specifies if the web store promotion was active.
+  static void RecordAppLaunch(bool promo_active);
+
   // The apps are represented in the extensions model.
   scoped_refptr<ExtensionsService> extensions_service_;
 
@@ -94,6 +105,9 @@ class AppLauncherHandler
   // The id of the extension we are prompting the user about.
   std::string extension_id_prompting_;
 
+  // Whether the promo is currently being shown.
+  bool promo_active_;
+
   DISALLOW_COPY_AND_ASSIGN(AppLauncherHandler);
 };