Implement newly designed sign-in related histograms for desktop platorms.

chrome/browser/ui/views/profiles/user_manager_view.cc

Index: chrome/browser/ui/views/profiles/user_manager_view.cc
diff --git a/chrome/browser/ui/views/profiles/user_manager_view.cc b/chrome/browser/ui/views/profiles/user_manager_view.cc
index 8e6c6a7498a9ecd1fb3546edad864dd8848bcd0d..9cd8fbf2ce2ff88bf670a92c382b875cb1aabe86 100644
--- a/chrome/browser/ui/views/profiles/user_manager_view.cc
+++ b/chrome/browser/ui/views/profiles/user_manager_view.cc
@@ -98,7 +98,9 @@ ReauthDelegate::ReauthDelegate(views::WebView* web_view,
   // Load the re-auth URL, prepopulated with the user's email address.
   // Add the index of the profile to the URL so that the inline login page
   // knows which profile to load and update the credentials.
-  GURL url = signin::GetReauthURLWithEmail(email_address_);
+  GURL url = signin::GetReauthURLWithEmail(
+      signin_metrics::ACCESS_POINT_USER_MANAGER, signin_metrics::REASON_UNLOCK,

[sky, 2015/12/03 22:45:28]

Isn't this reauth?

[gogerald1, 2015/12/04 20:49:09]

Here we unlocking the profile, the unlock process is an re-authentication
process, but we define the reason to be the purpose of getting the URL from user
point of view, so we say it is "UNLOCK".

+      email_address_);
   web_view_->LoadInitialURL(url);
 }