Fix accessible touch exploration inside of iframes.

content/test/accessibility_browser_test_utils.cc

Index: content/test/accessibility_browser_test_utils.cc
diff --git a/content/test/accessibility_browser_test_utils.cc b/content/test/accessibility_browser_test_utils.cc
index d44439bbe4e3da91409ef46954ed5c2f35f1ff18..4dc4c220253a1ace6dbe2c198050ac0582792906 100644
--- a/content/test/accessibility_browser_test_utils.cc
+++ b/content/test/accessibility_browser_test_utils.cc
@@ -24,6 +24,7 @@ AccessibilityNotificationWaiter::AccessibilityNotificationWaiter(Shell* shell)
     : event_to_wait_for_(ui::AX_EVENT_NONE),
       loop_runner_(new MessageLoopRunner()),
       event_target_id_(0),
+      event_render_frame_host_(nullptr),
       weak_factory_(this) {
   WebContents* web_contents = shell->web_contents();
   frame_host_ = static_cast<RenderFrameHostImpl*>(
@@ -91,10 +92,13 @@ const ui::AXTree& AccessibilityNotificationWaiter::GetAXTree() const {
 }
 
 void AccessibilityNotificationWaiter::OnAccessibilityEvent(
-    ui::AXEvent event_type, int event_target_id) {
-   if (!IsAboutBlank() && (event_to_wait_for_ == ui::AX_EVENT_NONE ||
+    RenderFrameHostImpl* rfhi,
+    ui::AXEvent event_type,
+    int event_target_id) {
+  if (!IsAboutBlank() && (event_to_wait_for_ == ui::AX_EVENT_NONE ||
                           event_to_wait_for_ == event_type)) {
     event_target_id_ = event_target_id;
+    event_render_frame_host_ = rfhi;
     loop_runner_->Quit();
   }
 }