Adding UMA stat when generated password set for newly created PasswordFormManager.

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 939e2de8743f575ae536ac3cf6a3ccee4839ab1e..84458c7d15f7c82f74c05f19f906fa803f02bd9c 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -27707,6 +27707,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="PasswordManager.GeneratedFormHasNoFormManager"
+    enum="BooleanFormManager">
+  <owner>gcasto@chromium.org</owner>
+  <owner>vabr@chromium.org</owner>
+  <owner>deepak.m1@samsung.com</owner>
+  <summary>
+    When the generation state of a password was changed, records whether an
+    existing form corresponding to the password was found.
+  </summary>
+</histogram>
+
 <histogram name="PasswordManager.InfoBarResponse" enum="InfoBarResponse">
   <owner>dubroy@chromium.org</owner>
   <owner>vabr@chromium.org</owner>
@@ -50502,6 +50513,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <int value="1" label="Force Disabled"/>
 </enum>
 
+<enum name="BooleanFormManager" type="int">
+  <int value="0" label="Has Form Manager"/>
+  <int value="1" label="Lacks Form Manager"/>
+</enum>
+
 <enum name="BooleanFromAddressBook" type="int">
   <int value="0" label="Not From Address Book"/>
   <int value="1" label="From Address Book"/>