Add a histogram for tracking web store promo

chrome/browser/dom_ui/app_launcher_handler.cc

Index: chrome/browser/dom_ui/app_launcher_handler.cc
diff --git a/chrome/browser/dom_ui/app_launcher_handler.cc b/chrome/browser/dom_ui/app_launcher_handler.cc
index 9bc27d250843a7881f8d5f725dd1338701c4aa54..29f97af9b2c20eedd4602256361a59f0f68869b4 100644
--- a/chrome/browser/dom_ui/app_launcher_handler.cc
+++ b/chrome/browser/dom_ui/app_launcher_handler.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/dom_ui/app_launcher_handler.h"
 
 #include "app/animation.h"
+#include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
@@ -56,7 +57,8 @@ std::string GetIconURL(const Extension* extension, Extension::Icons icon,
 }  // namespace
 
 AppLauncherHandler::AppLauncherHandler(ExtensionsService* extension_service)
-    : extensions_service_(extension_service) {
+    : extensions_service_(extension_service),
+      promo_active_(false) {
 }
 
 AppLauncherHandler::~AppLauncherHandler() {}
@@ -150,8 +152,10 @@ void AppLauncherHandler::FillAppDictionary(DictionaryValue* dictionary) {
   if (default_apps->ShouldShowPromo(extensions_service_->GetAppIds())) {
     dictionary->SetBoolean("showPromo", true);
     default_apps->DidShowPromo();
+    promo_active_ = true;
   } else {
     dictionary->SetBoolean("showPromo", false);
+    promo_active_ = false;
   }
 
   bool showLauncher =
@@ -220,6 +224,14 @@ void AppLauncherHandler::HandleLaunchApp(const ListValue* args) {
 
   if (new_contents != old_contents && browser->tab_count() > 1)
     browser->CloseTabContents(old_contents);
+
+  if (promo_active_ && extension_id != extension_misc::kWebStoreAppId) {
+    UMA_HISTOGRAM_ENUMERATION(extension_misc::kAppsPromoHistogram,
+                              extension_misc::PROMO_LAUNCH_APP,
+                              extension_misc::PROMO_BUCKET_BOUNDARY);
+  }
+  // TODO(jstritar): record histogram data for app launches that occur when
+  // the promo is not active.
 }
 
 void AppLauncherHandler::HandleSetLaunchType(const ListValue* args) {
@@ -271,6 +283,9 @@ void AppLauncherHandler::HandleHideAppsPromo(const ListValue* args) {
   // If the user has intentionally hidden the promotion, we'll uninstall all the
   // default apps (we know the user hasn't installed any apps on their own at
   // this point, or the promotion wouldn't have been shown).
+  UMA_HISTOGRAM_ENUMERATION(extension_misc::kAppsPromoHistogram,
+                            extension_misc::PROMO_CLOSE,
+                            extension_misc::PROMO_BUCKET_BOUNDARY);
   DefaultApps* default_apps = extensions_service_->default_apps();
   const ExtensionIdSet* app_ids = default_apps->GetDefaultApps();
   DCHECK(*app_ids == extensions_service_->GetAppIds());