Add User Actions and adding more details to UMA metrics for overscroll navigation

content/browser/web_contents/aura/gesture_nav_simple.cc

Index: content/browser/web_contents/aura/gesture_nav_simple.cc
diff --git a/content/browser/web_contents/aura/gesture_nav_simple.cc b/content/browser/web_contents/aura/gesture_nav_simple.cc
index e6c3601ecb7129d54fc003f2f688f6f05298029c..aaea4013544995be95055df42ed9dd6155953ad1 100644
--- a/content/browser/web_contents/aura/gesture_nav_simple.cc
+++ b/content/browser/web_contents/aura/gesture_nav_simple.cc
@@ -374,7 +374,8 @@ void GestureNavSimple::OnOverscrollComplete(OverscrollMode overscroll_mode) {
 }
 
 void GestureNavSimple::OnOverscrollModeChange(OverscrollMode old_mode,
-                                              OverscrollMode new_mode) {
+                                              OverscrollMode new_mode,
+                                              OverscrollSource source) {
   NavigationControllerImpl& controller = web_contents_->GetController();
   if (!ShouldNavigateForward(controller, new_mode) &&
       !ShouldNavigateBack(controller, new_mode)) {