Propagate inert state to OOPIFs when a modal dialog is active

third_party/WebKit/Source/core/html/HTMLDialogElement.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 63 matching lines @@
 
   if (dialog->IsFocusable()) {
     dialog->focus();
     return;
   }
 
   dialog->GetDocument().ClearFocusedElement();
 }
 
 static void InertSubtreesChanged(Document& document) {
+  // TODO(kenrb): Am I correct in thinking that this will never get called on
+  // and element that is in a frame that is already inert? If not, we
+  // need to get the embedding frame's inert value and use that instead of
+  // false.
+  if (document.GetFrame())
+    document.GetFrame()->SetIsInert(false);
+
   // When a modal dialog opens or closes, nodes all over the accessibility
   // tree can change inertness which means they must be added or removed from
   // the tree. The most foolproof way is to clear the entire tree and rebuild
   // it, though a more clever way is probably possible.
   document.ClearAXObjectCache();
   if (AXObjectCache* cache = document.AxObjectCache())
     cache->ChildrenChanged(&document);
 }
 
 inline HTMLDialogElement::HTMLDialogElement(Document& document)
@@ skipping 81 matching lines @@
   // is thrown away.
   InertSubtreesChanged(GetDocument());
 
   ForceLayoutForCentering();
   SetFocusForDialog(this);
 }
 
 void HTMLDialogElement::RemovedFrom(ContainerNode* insertion_point) {
   HTMLElement::RemovedFrom(insertion_point);
   SetNotCentered();
   // FIXME: We should call inertSubtreesChanged() here.

[kenrb, 2017/05/15 20:51:53]

Does this become a problem? With an inert bit being cached on Frames, I am
concerned this might create situations where Frames are stuck being inert.

 }
 
 void HTMLDialogElement::SetCentered(LayoutUnit centered_position) {
   DCHECK_EQ(centering_mode_, kNeedsCentering);
   centered_position_ = centered_position;
   centering_mode_ = kCentered;
 }
 
 void HTMLDialogElement::SetNotCentered() {
   centering_mode_ = kNotCentered;
@@ skipping 13 matching lines @@
 void HTMLDialogElement::DefaultEventHandler(Event* event) {
   if (event->type() == EventTypeNames::cancel) {
     CloseDialog();
     event->SetDefaultHandled();
     return;
   }
   HTMLElement::DefaultEventHandler(event);
 }
 
 }  // namespace blink