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

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 e8ba40f4b11a036f11c0527587049dfb952ec248..dc7a7f853f8f70709cd9607dd28d52e1f985e9c6 100644
--- a/content/test/accessibility_browser_test_utils.cc
+++ b/content/test/accessibility_browser_test_utils.cc
@@ -23,7 +23,8 @@ 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());
@@ -39,7 +40,8 @@ AccessibilityNotificationWaiter::AccessibilityNotificationWaiter(
     : 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());
@@ -61,9 +63,10 @@ const ui::AXTree& AccessibilityNotificationWaiter::GetAXTree() const {
 }
 
 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();
   }
 }