Fix Chrome OS virtual keyboard accessibility

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 2509f350c37c6ff3e98ef52753581fb9f9b11719..a37f83d1d343f30e4fbc5840bd864e1108e7a30f 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -4508,6 +4508,11 @@ void WebContentsImpl::RenderViewReady(RenderViewHost* rvh) {
     return;
   }
 
+  RenderWidgetHostViewBase* rwhv =
+      static_cast<RenderWidgetHostViewBase*>(GetRenderWidgetHostView());
+  if (rwhv)
+    rwhv->SetMainFrameAXTreeID(GetMainFrame()->GetAXTreeID());
+
   notify_disconnection_ = true;
   // TODO(avi): Remove. http://crbug.com/170921
   NotificationService::current()->Notify(
@@ -5068,6 +5073,11 @@ void WebContentsImpl::NotifySwappedFromRenderManager(RenderFrameHost* old_host,
       view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 
     view_->RenderViewSwappedIn(new_host->GetRenderViewHost());
+
+    RenderWidgetHostViewBase* rwhv =
+        static_cast<RenderWidgetHostViewBase*>(GetRenderWidgetHostView());
+    if (rwhv)
+      rwhv->SetMainFrameAXTreeID(GetMainFrame()->GetAXTreeID());
   }
 
   NotifyFrameSwapped(old_host, new_host);