Add PasswordManager.SignInPromoCountTil* histograms for the sign-in promo in the password bubble.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 56f9b96531e1149f2092e5c6ce4fcf4f49ebaf3d..7b533a1fd23e182d4b1de81dc0ebdd971fa38645 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -43952,6 +43952,10 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="PasswordManager.SignInPromoCountTilClick">
+  <obsolete>
+    Deprecated as of 12/16/16. New statistic is
+    PasswordManager.SignInPromoCountTil*.
+  </obsolete>
   <owner>vasilii@chromium.org</owner>
   <summary>
     The number of times the Sign In promo in the password bubble was shown
@@ -43959,6 +43963,22 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="PasswordManager.SignInPromoCountTilNoThanks">
+  <owner>vasilii@chromium.org</owner>
+  <summary>
+    The number of times the Sign In promo in the password bubble was shown
+    before user clicked on &quot;No thanks&quot;.
+  </summary>
+</histogram>
+
+<histogram name="PasswordManager.SignInPromoCountTilSignIn">
+  <owner>vasilii@chromium.org</owner>
+  <summary>
+    The number of times the Sign In promo in the password bubble was shown
+    before user clicked on &quot;Sign in&quot;.
+  </summary>
+</histogram>
+
 <histogram name="PasswordManager.SignInPromoDismissalCount">
   <owner>vasilii@chromium.org</owner>
   <summary>