Implement Android accessible hit testing using an IPC to the renderer process.

content/test/accessibility_browser_test_utils.cc

 // Copyright 2013 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/test/accessibility_browser_test_utils.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/common/view_message_enums.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/test_utils.h"
 #include "content/shell/browser/shell.h"
 #include "ui/accessibility/ax_node.h"
 
 namespace content {
 
 AccessibilityNotificationWaiter::AccessibilityNotificationWaiter(Shell* shell)
     : shell_(shell),
       event_to_wait_for_(ui::AX_EVENT_NONE),
       loop_runner_(new MessageLoopRunner()),
-      weak_factory_(this) {
+      weak_factory_(this),
+      event_target_id_(0) {
   WebContents* web_contents = shell_->web_contents();
   view_host_ = static_cast<RenderViewHostImpl*>(
       web_contents->GetRenderViewHost());
   view_host_->SetAccessibilityCallbackForTesting(
       base::Bind(&AccessibilityNotificationWaiter::OnAccessibilityEvent,
                  weak_factory_.GetWeakPtr()));
 }
 
 AccessibilityNotificationWaiter::AccessibilityNotificationWaiter(
     Shell* shell,
     AccessibilityMode accessibility_mode,
     ui::AXEvent event_type)
     : shell_(shell),
       event_to_wait_for_(event_type),
       loop_runner_(new MessageLoopRunner()),
-      weak_factory_(this) {
+      weak_factory_(this),
+      event_target_id_(0) {
   WebContents* web_contents = shell_->web_contents();
   view_host_ = static_cast<RenderViewHostImpl*>(
       web_contents->GetRenderViewHost());
   view_host_->SetAccessibilityCallbackForTesting(
       base::Bind(&AccessibilityNotificationWaiter::OnAccessibilityEvent,
                  weak_factory_.GetWeakPtr()));
   view_host_->AddAccessibilityMode(accessibility_mode);
 }
 
 AccessibilityNotificationWaiter::~AccessibilityNotificationWaiter() {
 }
 
 void AccessibilityNotificationWaiter::WaitForNotification() {
   loop_runner_->Run();
 }
 
 const ui::AXTree& AccessibilityNotificationWaiter::GetAXTree() const {
   return view_host_->ax_tree_for_testing();
 }
 
 void AccessibilityNotificationWaiter::OnAccessibilityEvent(
-    ui::AXEvent event_type) {
+    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;
     loop_runner_->Quit();
   }
 }
 
 bool AccessibilityNotificationWaiter::IsAboutBlank() {
   // Skip any accessibility notifications related to "about:blank",
   // to avoid a possible race condition between the test beginning
   // listening for accessibility events and "about:blank" loading.
   const ui::AXNodeData& root = GetAXTree().GetRoot()->data();
   for (size_t i = 0; i < root.string_attributes.size(); ++i) {
     if (root.string_attributes[i].first != ui::AX_ATTR_DOC_URL)
       continue;
     const std::string& doc_url = root.string_attributes[i].second;
     return doc_url == kAboutBlankURL;
   }
   return false;
 }
 
 }  // namespace content