Adding Histograms for new Desktop First Run.

chrome/browser/ui/webui/welcome_handler.cc

Index: chrome/browser/ui/webui/welcome_handler.cc
diff --git a/chrome/browser/ui/webui/welcome_handler.cc b/chrome/browser/ui/webui/welcome_handler.cc
index c6b91f6d312a5e533471516f7d3630e9bfd65035..d75ae47d5bafee95be704654f3cb4761c7a50046 100644
--- a/chrome/browser/ui/webui/welcome_handler.cc
+++ b/chrome/browser/ui/webui/welcome_handler.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/ui/webui/welcome_handler.h"
 
+#include "base/metrics/histogram_macros.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
@@ -26,7 +27,8 @@ WelcomeHandler::WelcomeHandler(content::WebUI* web_ui)
 
 WelcomeHandler::~WelcomeHandler() {
   oauth2_token_service_->RemoveObserver(this);
-  // TODO(tmartino): Log to UMA according to WelcomeResult.
+  UMA_HISTOGRAM_ENUMERATION("Welcome.SignInPromptResult", result_,
+                            WelcomeResult::WELCOME_RESULT_MAX);
 }
 
 // Override from OAuth2TokenService::Observer. Occurs when a new auth token is