[Smart Lock, Settings Reconciliation] Histograms for tracking initial pref values.

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 49b59a31024ffe7d749bbb3955d0ad121d526a79..5a31867f1e304fbb78caca57b9c8961062c38db0 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -30244,6 +30244,19 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="PasswordManager.SettingsReconciliation.InitialValues"
+    enum="PasswordManagerPreferencesInitialValues">
+  <owner>engedy@chromium.org</owner>
+  <owner>melandory@chromium.org</owner>
+  <summary>
+    Tracks the pair of initial values for both for the legacy preference for
+    controlling the Chrome Password Manager and new preference for controlling
+    Smart Lock on Android. Sample is recorded on every profile initialization
+    before reconciliation logic is taken place, e.g. when user logs in to
+    browser, on a startup of a browser.
+  </summary>
+</histogram>
+
 <histogram name="PasswordManager.StoreReadyWhenWiping" enum="Boolean">
   <owner>vabr@chromium.org</owner>
   <summary>
@@ -66875,6 +66888,18 @@ To add a new entry, add it with any value and run test to compute valid value.
       label="Password status not checked as user is on a Windows Domain"/>
 </enum>
 
+<enum name="PasswordManagerPreferencesInitialValues" type="int">
+  <summary>
+    The pair of initial values for the legacy preference for controlling the
+    Chrome Password Manager and new preference for controlling Smart Lock on
+    Android.
+  </summary>
+  <int value="0" label="New pref is 'off', legacy pref is 'off'"/>
+  <int value="1" label="New pref is 'off', legacy pref is 'on'"/>
+  <int value="2" label="New pref is 'on', legacy pref is 'off'"/>
+  <int value="3" label="New pref is 'on', legacy pref is 'on'"/>
+</enum>
+
 <enum name="PasswordManagerPslDomainMatchTriggering" type="int">
   <summary>
     The value indicates whether an entry returned by password autofill contains