Reland of Uses the activedescendant_changed event received from Blink to fire the right focus event

content/browser/accessibility/browser_accessibility_manager_android.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/browser/accessibility/browser_accessibility_manager_android.h"
 
 #include <stddef.h>
 
 #include <cmath>
 
@@ skipping 174 matching lines @@
 bool BrowserAccessibilityManagerAndroid::ShouldExposePasswordText() {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = GetJavaRefFromRootManager();
   if (obj.is_null())
     return false;
 
   return Java_BrowserAccessibilityManager_shouldExposePasswordText(
       env, obj.obj());
 }
 
+BrowserAccessibility* BrowserAccessibilityManagerAndroid::GetFocus() {
+  BrowserAccessibility* focus = BrowserAccessibilityManager::GetFocus();
+  return GetActiveDescendant(focus);
+}
+
 void BrowserAccessibilityManagerAndroid::NotifyAccessibilityEvent(
     BrowserAccessibilityEvent::Source source,
     ui::AXEvent event_type,
     BrowserAccessibility* node) {
   JNIEnv* env = AttachCurrentThread();
   ScopedJavaLocalRef<jobject> obj = GetJavaRefFromRootManager();
   if (obj.is_null())
     return;
 
   BrowserAccessibilityAndroid* android_node =
@@ skipping 744 matching lines @@
 
   JNIEnv* env = AttachCurrentThread();
   return root_manager->java_ref().get(env);
 }
 
 bool RegisterBrowserAccessibilityManager(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content