Implement accessibility support for CSS-transformed iframes.

content/browser/accessibility/dump_accessibility_browsertest_base.cc

 // Copyright 2014 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 "content/browser/accessibility/dump_accessibility_browsertest_base.h"
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "content/browser/accessibility/accessibility_tree_formatter.h"
 #include "content/browser/accessibility/accessibility_tree_formatter_blink.h"
 #include "content/browser/accessibility/browser_accessibility.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/accessibility/browser_accessibility_state_impl.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/browser/web_contents.h"
 #include "content/public/common/content_paths.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/url_constants.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/public/test/test_utils.h"
 #include "content/shell/browser/shell.h"
@@ skipping 220 matching lines @@
   for (FrameTreeNode* node : frame_tree->Nodes()) {
     // Ignore about:blank urls because of the case where a parent frame A
     // has a child iframe B and it writes to the document using
     // contentDocument.open() on the child frame B.
     //
     // In this scenario, B's contentWindow.location.href matches A's url,
     // but B's url in the browser frame tree is still "about:blank".
     std::string url = node->current_url().spec();
     if (url != url::kAboutBlankURL)
       all_frame_urls.push_back(url);
+
+    // We won't get the correct coordinate transformations for
+    // out-of-process iframes until each frame's surface is ready.
+    RenderFrameHostImpl* current_frame_host = node->current_frame_host();
+    if (!current_frame_host)
+      continue;
+    RenderWidgetHostImpl* rwh = current_frame_host->GetRenderWidgetHost();
+    if (!rwh)
+      continue;
+    RenderWidgetHostViewBase* rwhv = rwh->GetView();
+    if (rwhv && rwhv->IsChildFrameForTesting()) {
+      SurfaceHitTestReadyNotifier notifier(
+          static_cast<RenderWidgetHostViewChildFrame*>(rwhv));
+      notifier.WaitForSurfaceReady();
+    }
   }
 
   // Wait for the accessibility tree to fully load for all frames,
   // by searching for the WEB_AREA node in the accessibility tree
   // with the url of each frame in our frame tree. Note that this
   // doesn't support cases where there are two iframes with the
   // exact same url. If all frames haven't loaded yet, set up a
   // listener for accessibility events on any frame and block
   // until the next one is received.
   //
@@ skipping 95 matching lines @@
           expected_file, actual_contents.c_str(), actual_contents.size()));
       LOG(INFO) << "Wrote expectations to: "
                 << expected_file.LossyDisplayName();
     }
   } else {
     LOG(INFO) << "Test output matches expectations.";
   }
 }
 
 }  // namespace content