[WIP] Split AutofillDialogControllerImpl + integrate rAc on Android.

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 27d9d895b5f59cb3030ed94db11001f03a7e34f8..87ddb02c671780678cb8bdc67176058e6dd74555 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1132,6 +1132,10 @@ const char kAutofillDialogShowCount[] = "autofill.show_count";
 const char kAutofillGeneratedCardBubbleTimesShown[] =
     "autofill.generated_card_bubble_times_shown";
 
+// A dictionary that tracks the defaults to be set on the next invocation
+// of the requestAutocomplete/Autocheckout dialog.
+const char kAutofillDialogDefaults[] = "autofill.rac_dialog_defaults";
+
 // Modifying bookmarks is completely disabled when this is set to false.
 const char kEditBookmarksEnabled[] = "bookmarks.editing_enabled";