Implemented IAccessible2 reverse relations.

content/renderer/accessibility/blink_ax_tree_source.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/renderer/accessibility/blink_ax_tree_source.h"
 
 #include <stddef.h>
 
 #include <set>
 
@@ skipping 533 matching lines @@
     if (src.liveRegionBusy())
       dst->state |= (1 << ui::AX_STATE_BUSY);
     if (!src.liveRegionStatus().isEmpty()) {
       dst->AddStringAttribute(
           ui::AX_ATTR_LIVE_STATUS,
           src.liveRegionStatus().utf8());
     }
     dst->AddStringAttribute(
         ui::AX_ATTR_LIVE_RELEVANT,
         src.liveRegionRelevant().utf8());
+    // If we are not at the root of an atomic live region.
+    if (src.containerLiveRegionAtomic() && !src.liveRegionRoot().isDetached() &&
+        !src.liveRegionAtomic()) {
+      dst->AddIntAttribute(ui::AX_ATTR_MEMBER_OF_ID,
+                           src.liveRegionRoot().axID());
+    }
     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_ATOMIC,
                           src.containerLiveRegionAtomic());
     dst->AddBoolAttribute(ui::AX_ATTR_CONTAINER_LIVE_BUSY,
                           src.containerLiveRegionBusy());
     dst->AddStringAttribute(
         ui::AX_ATTR_CONTAINER_LIVE_STATUS,
         src.containerLiveRegionStatus().utf8());
     dst->AddStringAttribute(
         ui::AX_ATTR_CONTAINER_LIVE_RELEVANT,
         src.containerLiveRegionRelevant().utf8());
@@ skipping 118 matching lines @@
   }
 }
 
 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
   if (render_frame_ && render_frame_->GetWebFrame())
     return render_frame_->GetWebFrame()->document();
   return WebDocument();
 }
 
 }  // namespace content