Add metrics for interactions with the Apps Launcher promo dialog.

chrome/browser/ui/webui/ntp/app_launcher_handler.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/webui/ntp/app_launcher_handler.h"
 
 #include <vector>
 
+#include "apps/metrics_names.h"
 #include "apps/pref_names.h"
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/i18n/rtl.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 186 matching lines @@
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback("generateAppForLink",
       base::Bind(&AppLauncherHandler::HandleGenerateAppForLink,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback("recordAppLaunchByURL",
       base::Bind(&AppLauncherHandler::HandleRecordAppLaunchByUrl,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback("stopShowingAppLauncherPromo",
       base::Bind(&AppLauncherHandler::StopShowingAppLauncherPromo,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("onLearnMore",
+      base::Bind(&AppLauncherHandler::OnLearnMore,
+                 base::Unretained(this)));
 }
 
 void AppLauncherHandler::Observe(int type,
                                  const content::NotificationSource& source,
                                  const content::NotificationDetails& details) {
   if (type == chrome::NOTIFICATION_APP_INSTALLED_TO_NTP) {
     highlight_app_id_ = *content::Details<const std::string>(details).ptr();
     if (has_loaded_apps_)
       SetAppToBeHighlighted();
     return;
@@ skipping 462 matching lines @@
       static_cast<extension_misc::AppLaunchBucket>(static_cast<int>(source));
   CHECK(source < extension_misc::APP_LAUNCH_BUCKET_BOUNDARY);
 
   RecordAppLaunchByUrl(Profile::FromWebUI(web_ui()), url, bucket);
 }
 
 void AppLauncherHandler::StopShowingAppLauncherPromo(
     const base::ListValue* args) {
   g_browser_process->local_state()->SetBoolean(
       apps::prefs::kShowAppLauncherPromo, false);
+  UMA_HISTOGRAM_ENUMERATION(apps::kAppLauncherPromoHistogram,
+                            apps::APP_LAUNCHER_PROMO_DISMISSED,
+                            apps::APP_LAUNCHER_PROMO_MAX);

[Ilya Sherman, 2013/06/25 21:35:15]

I'd strongly recommend creating a method like
apps::LogAppLauncherPromoHistogram(), and just passing in
apps::APP_LAUNCHER_PROMO_DISMISSED from here.  That both reduces the total
number of lines of code, and makes it harder for a single callsite to have a
typo or other easy-to-miss error.

[MAD, 2013/06/26 03:33:40]

Done.

+
+}
+
+void AppLauncherHandler::OnLearnMore(
+    const base::ListValue* args) {
+  UMA_HISTOGRAM_ENUMERATION(apps::kAppLauncherPromoHistogram,
+                            apps::APP_LAUNCHER_PROMO_LEARN_MORE,
+                            apps::APP_LAUNCHER_PROMO_MAX);
+
 }
 
 void AppLauncherHandler::OnFaviconForApp(
     scoped_ptr<AppInstallInfo> install_info,
     const chrome::FaviconImageResult& image_result) {
   scoped_ptr<WebApplicationInfo> web_app(new WebApplicationInfo());
   web_app->is_bookmark_app = install_info->is_bookmark_app;
   web_app->title = install_info->title;
   web_app->app_url = install_info->app_url;
   web_app->urls.push_back(install_info->app_url);
@@ skipping 167 matching lines @@
 ExtensionUninstallDialog* AppLauncherHandler::GetExtensionUninstallDialog() {
   if (!extension_uninstall_dialog_.get()) {
     Browser* browser = chrome::FindBrowserWithWebContents(
         web_ui()->GetWebContents());
     extension_uninstall_dialog_.reset(
         ExtensionUninstallDialog::Create(extension_service_->profile(),
                                          browser, this));
   }
   return extension_uninstall_dialog_.get();
 }