Re-add the line break attribute

content/renderer/accessibility/blink_ax_tree_source.cc

Index: content/renderer/accessibility/blink_ax_tree_source.cc
diff --git a/content/renderer/accessibility/blink_ax_tree_source.cc b/content/renderer/accessibility/blink_ax_tree_source.cc
index f97a7548cd0737fcbb6b4ea079e5c8393d5ed751..fb20ac4b7ef05e364de7a7cd4ef2d1a60d5bd061 100644
--- a/content/renderer/accessibility/blink_ax_tree_source.cc
+++ b/content/renderer/accessibility/blink_ax_tree_source.cc
@@ -547,6 +547,19 @@ void BlinkAXTreeSource::SerializeNode(blink::WebAXObject src,
     if (src.isEditable()) {
       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_START, src.selectionStart());
       dst->AddIntAttribute(ui::AX_ATTR_TEXT_SEL_END, src.selectionEnd());
+
+#if defined(OS_CHROMEOS)
+      // This attribute will soon be deprecated; see crbug.com/669134.
+      WebVector<int> src_line_breaks;
+      src.lineBreaks(src_line_breaks);
+      if (src_line_breaks.size()) {
+        std::vector<int32_t> line_breaks;
+        line_breaks.reserve(src_line_breaks.size());
+        for (size_t i = 0; i < src_line_breaks.size(); ++i)
+          line_breaks.push_back(src_line_breaks[i]);
+        dst->AddIntListAttribute(ui::AX_ATTR_LINE_BREAKS, line_breaks);
+      }
+#endif  // defined OS_CHROMEOS
     }
 
     // ARIA role.