Experiment to add bank name in autofill ui.

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 3c693441c30915f49c2b6f9cfb23b51caa01d1ae..a98968d1c63059a79eec6113f655b70430b3d9b9 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -4002,6 +4002,23 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </details>
 </histogram>
 
+<histogram name="Autofill.FormEvents.CreditCard.BankNameExperiment"
+    enum="BankNameExperimentFormEvent">
+  <owner>szhangcs@google.com</owner>
+  <summary>
+    Autofill form events for measuring the impact of the bank name experiment.
+    These are recorded when the user interacts with a form requesting a credit
+    card.
+  </summary>
+  <details>
+    These metrics are used to measure the CTR on autofill UI with bank names
+    available. Not all credit cards will have bank names even if we launch the
+    experiment. With these metrics we can run the experiment on 2 groups. For
+    one group, we will show bank names if available. For the other, we won't
+    shown.
+  </details>
+</histogram>
+
 <histogram name="Autofill.FormEvents.CreditCard.OnNonsecurePage"
     enum="AutofillFormEvent">
   <owner>estark@chromium.org</owner>