Add tests to exercise hypertext on hidden iframes

TBR=kbabbitt@microsoft.com

Bug: None
Change-Id: I14d580e7e20409fdf2ecc4d8a9294076f11ec07d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584562Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836899}

content/browser/accessibility/dump_accessibility_tree_browsertest.cc

@@ -1692,6 +1692,11 @@ IN_PROC_BROWSER_TEST_P(DumpAccessibilityTreeTest, AccessibilityIframe) {
   RunHtmlTest(FILE_PATH_LITERAL("iframe.html"));
 }
 
+IN_PROC_BROWSER_TEST_P(DumpAccessibilityTreeTest,
+                       AccessibilityIframeAriaHidden) {
+  RunHtmlTest(FILE_PATH_LITERAL("iframe-aria-hidden.html"));
+}
+
 IN_PROC_BROWSER_TEST_P(DumpAccessibilityTreeTest,
                        AccessibilityIframeScrollable) {
   RunHtmlTest(FILE_PATH_LITERAL("iframe-scrollable.html"));

content/test/data/accessibility/html/iframe-aria-hidden-expected-android.txt

+android.webkit.WebView focusable focused scrollable
+++android.view.View invisible
+++android.view.View invisible
\ No newline at end of file

content/test/data/accessibility/html/iframe-aria-hidden-expected-auralinux.txt

+[document web]
+++[internal frame]
+++[internal frame]

content/test/data/accessibility/html/iframe-aria-hidden-expected-blink.txt

+rootWebArea
+++genericContainer ignored
+++++genericContainer ignored
+++++++iframe invisible
+++++++iframe invisible

content/test/data/accessibility/html/iframe-aria-hidden-expected-mac.txt

+AXWebArea
\ No newline at end of file

content/test/data/accessibility/html/iframe-aria-hidden-expected-uia-win.txt

+Document
+++Document IsControlElement=false
+++Document IsControlElement=false
\ No newline at end of file

content/test/data/accessibility/html/iframe-aria-hidden-expected-win.txt

+ROLE_SYSTEM_DOCUMENT READONLY FOCUSABLE ia2_hypertext='<obj0><obj1>'
+++IA2_ROLE_INTERNAL_FRAME INVISIBLE
+++IA2_ROLE_INTERNAL_FRAME INVISIBLE
\ No newline at end of file

content/test/data/accessibility/html/iframe-aria-hidden.html

+<!--
+@WIN-ALLOW:ia2_hypertext=*
+-->
+<iframe tabindex="-1" aria-hidden="true" style="position: absolute; width: 9em; height: 9em; top: -99em;"></iframe>
+<iframe aria-hidden="true" style="position: absolute; width: 9em; height: 9em; top: -99em;"></iframe>

content/test/data/accessibility/html/iframe.html

@@ -3,6 +3,7 @@
 @WIN-ALLOW:ia2_hypertext=*
 @WIN-ALLOW:parent=*
 @WIN-ALLOW:window_class=*
+@WIN-ALLOW:ia2_hypertext=*
 @BLINK-ALLOW:scrollable=*
 TODO(accessibility) this should eventually show scrollable=false for both the main doc and iframe. See matching TODO in AXObject::IsUserScrollable().
 -->