🔍 Add first run dialog for selecting search engine

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 dac9e05f6f974a6c3db3d335d29bc7151446df9c..410bcabac3c9e0e8c63937faaac4c74b83ac7271 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -30604,7 +30604,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>
     Android: Records which states of the &quot;first run experience&quot; have
     been reached. Each bucket represents a state and recorded everytime the
-    state changed.
+    state changed.  Pages can be double counted if the user goes backwards in
+    the flow.
   </summary>
 </histogram>
 
@@ -106403,6 +106404,7 @@ from previous Chrome versions.
   <int value="3" label="Sign in shown"/>
   <int value="4" label="FRE completed w/ user signed in"/>
   <int value="5" label="FRE completed w/ user not signed in"/>
+  <int value="6" label="Search engine choice dialog shown"/>
 </enum>
 
 <enum name="MobileFreSignInChoice" type="int">