Audit that user gesture bit is consistent from willstart to commit.

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index c58618c022319fce402850e6248941d9f8fae473..b13586bc43c583696f79dc5012b76fc76f114c66 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -522,6 +522,9 @@ void NavigationHandleImpl::DidCommitNavigation(
   DCHECK(!render_frame_host_ || render_frame_host_ == render_frame_host);
   DCHECK_EQ(frame_tree_node_, render_frame_host->frame_tree_node());
   CHECK_EQ(url_, params.url);
+  if (!same_page)
+    DCHECK_EQ(has_user_gesture_, params.gesture == NavigationGestureUser)
+        << GetURL();
 
   method_ = params.method;
   has_user_gesture_ = (params.gesture == NavigationGestureUser);