Propagate inert state to OOPIFs when a modal dialog is active

third_party/WebKit/LayoutTests/html/dialog/inert-focus-in-frames.html

Index: third_party/WebKit/LayoutTests/html/dialog/inert-focus-in-frames.html
diff --git a/third_party/WebKit/LayoutTests/html/dialog/inert-focus-in-frames.html b/third_party/WebKit/LayoutTests/html/dialog/inert-focus-in-frames.html
index 64815f7f67e3cd17352cadff52af2a9d4f77ea35..abbc38998dcf7d9ebb2d046c0bcfcaa9198dd580 100644
--- a/third_party/WebKit/LayoutTests/html/dialog/inert-focus-in-frames.html
+++ b/third_party/WebKit/LayoutTests/html/dialog/inert-focus-in-frames.html
@@ -39,13 +39,17 @@ function test() {
     frame1.querySelector('dialog').showModal();
 
     testFocus(frame1.querySelector('.target'), false);
-    var iframe = frame1.querySelector('iframe').contentDocument;
+    var iframe = frame1.querySelector('#iframe1').contentDocument;
     testFocus(iframe.querySelector('.target'), false);
 
     debug('Even a modal dialog in the iframe is blocked by the modal dialog in the parent frame1.');
     iframe.querySelector('dialog').showModal();
     testFocus(iframe.querySelector('button'), false);
 
+    debug('An iframe within a modal dialog can still be focused.');
+    var dialogIframe = frame1.querySelector('#iframe-in-dialog').contentDocument;
+    testFocus(dialogIframe.querySelector('.target'), true);
+
     debug('A modal dialog does not block nodes in a sibling frame.');
     var frame2 = mainIframe.contentWindow.frames[1].document;
     testFocus(frame2.querySelector('.target'), true);