Create OOBE screen for Voice Interaction value proposition

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 15adf88b471e4182287a0545ebc3371a58cc7259..cc4c055f27e1f8470c87d14a495f0e2781ff9344 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -54,6 +54,9 @@ const char kArcSignedIn[] = "arc.signedin";
 // the user directory (i.e., the user finished required migration.)
 extern const char kArcCompatibleFilesystemChosen[] =
     "arc.compatible_filesystem.chosen";
+// A preference that indicates that user accepted Assistant Value Prop.
+const char kArcVoiceInteractionValuePropAccepted[] =
+    "arc.voice_interaction_value_prop.accepted";
 #endif
 
 // A bool pref that keeps whether the child status for this profile was already