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 7f45ab817ae157f7ba283b6ff1d8377b1b87c5af..2e6fda09ecfbc5686a53830b6bf83613998a4ee6 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -4461,6 +4461,11 @@ 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(
@@ -5020,6 +5025,11 @@ 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);