Add metrics for interactions with the Apps Launcher promo dialog.

chrome/browser/ui/webui/app_launcher_page_ui.cc

Index: chrome/browser/ui/webui/app_launcher_page_ui.cc
diff --git a/chrome/browser/ui/webui/app_launcher_page_ui.cc b/chrome/browser/ui/webui/app_launcher_page_ui.cc
index f8cc98e006e172b248ead8b6d1f9c426302f3da2..65c8a489ae1ec2312bfa372345bb55e8841e85cd 100644
--- a/chrome/browser/ui/webui/app_launcher_page_ui.cc
+++ b/chrome/browser/ui/webui/app_launcher_page_ui.cc
@@ -4,7 +4,10 @@
 
 #include "chrome/browser/ui/webui/app_launcher_page_ui.h"
 
+#include "apps/app_launcher.h"
+#include "apps/metrics_names.h"
 #include "base/memory/ref_counted_memory.h"
+#include "base/metrics/histogram.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/webui/ntp/app_launcher_handler.h"
 #include "chrome/browser/ui/webui/ntp/app_resource_cache_factory.h"
@@ -109,6 +112,19 @@ void AppLauncherPageUI::HTMLSource::StartDataRequest(
   scoped_refptr<base::RefCountedMemory> html_bytes(
       resource->GetNewTabHTML(is_incognito));
 
+  if (!is_incognito && apps::ShouldShowAppLauncherPromo()) {
+    if (apps::IsAppLauncherEnabled()) {
+      UMA_HISTOGRAM_ENUMERATION(apps::kAppLauncherPromoHistogram,
+                                apps::APP_LAUNCHER_PROMO_ALREADY_INSTALLED,
+                                apps::APP_LAUNCHER_PROMO_MAX);
+    } else {
+      UMA_HISTOGRAM_ENUMERATION(apps::kAppLauncherPromoHistogram,
+                                apps::APP_LAUNCHER_PROMO_SHOWN,
+                                apps::APP_LAUNCHER_PROMO_MAX);
+    }
+  }
+

[miket_OOO, 2013/06/25 15:57:25]

Extra whitespace not needed.

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

Done.

+
   callback.Run(html_bytes.get());
 }