Add kAccessibilityFocusFallsbackToWidget property

chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc

Index: chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc
diff --git a/chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc b/chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc
index d1f2c1f760c70454ac7d06bc8d0b7a510fc6bd55..fb835af6960c7cc42af12228a581c81f9b77769d 100644
--- a/chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc
+++ b/chrome/browser/chromeos/accessibility/spoken_feedback_browsertest.cc
@@ -500,7 +500,11 @@ IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, OverviewMode) {
       break;
   }
 
-  EXPECT_EQ("Entered window overview mode", speech_monitor_.GetNextUtterance());
+  while (true) {
+    std::string utterance = speech_monitor_.GetNextUtterance();
+    if (utterance == "Entered window overview mode")
+      break;
+  }
 
   SendKeyPress(ui::VKEY_TAB);
   // On Chrome OS accessibility title for tabbed browser windows contains app
@@ -534,9 +538,12 @@ IN_PROC_BROWSER_TEST_P(SpokenFeedbackTest, MAYBE_ChromeVoxShiftSearch) {
 
   // Press Search+/ to enter ChromeVox's "find in page".
   SendKeyPressWithSearch(ui::VKEY_OEM_2);
-  EXPECT_EQ(", window", speech_monitor_.GetNextUtterance());
-  EXPECT_EQ("webView", speech_monitor_.GetNextUtterance());
-  EXPECT_EQ("Find in page.", speech_monitor_.GetNextUtterance());
+
+  while (true) {
+    std::string utterance = speech_monitor_.GetNextUtterance();
+    if (utterance == "Find in page.")
+      break;
+  }
 }
 
 #if defined(MEMORY_SANITIZER)