Fix TouchExplorationInCrossSiteIframe flakiness with OOPIFs enabled

content/browser/accessibility/touch_accessibility_aura_browsertest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/macros.h"
 #include "base/strings/string_number_conversions.h"
 #include "content/browser/accessibility/browser_accessibility.h"
+#include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/content_browser_test.h"
 #include "content/public/test/content_browser_test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "content/test/accessibility_browser_test_utils.h"
+#include "content/test/content_browser_test_utils_internal.h"
 #include "net/dns/mock_host_resolver.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/events/event.h"
 #include "ui/events/event_sink.h"
 #include "ui/events/event_utils.h"
 
 namespace content {
@@ skipping 135 matching lines @@
 
   // Get the BrowserAccessibilityManager for the first child frame.
   RenderFrameHostImpl* main_frame = static_cast<RenderFrameHostImpl*>(
       shell()->web_contents()->GetMainFrame());
   RenderFrameHostImpl* child_frame =
       main_frame->frame_tree_node()->child_at(0)->current_frame_host();
   BrowserAccessibilityManager* child_manager =
       child_frame->GetOrCreateBrowserAccessibilityManager();
   ASSERT_NE(nullptr, child_manager);
 
+  // If OOPIFs are enabled, wait until compositor frames are all properly
+  // displayed, otherwise the touch event will not get sent to the correct
+  // renderer process.
+  if (main_frame->GetView() != child_frame->GetView()) {
+    SurfaceHitTestReadyNotifier notifier(
+        static_cast<RenderWidgetHostViewChildFrame*>(child_frame->GetView()));
+    notifier.WaitForSurfaceReady();
+  }
+
   // Send a touch exploration event to the button in the first iframe.
   // A touch exploration event is just a mouse move event with
   // the ui::EF_TOUCH_ACCESSIBILITY flag set.
   AccessibilityNotificationWaiter waiter(
       child_frame, ui::AX_EVENT_HOVER);
   SendTouchExplorationEvent(50, 350);
   waiter.WaitForNotification();
   int target_id = waiter.event_target_id();
   BrowserAccessibility* hit = child_manager->GetFromID(target_id);
   EXPECT_EQ(ui::AX_ROLE_BUTTON, hit->GetData().role);
   std::string text = hit->GetData().GetStringAttribute(ui::AX_ATTR_NAME);
   EXPECT_EQ("Ordinary Button", text);
 }
 
 }  // namespace content