Expose html placeholder attribute as AXPlaceholder: <value> on MAC.

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 <set>
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
@@ skipping 270 matching lines @@
   if (src.accessibilityDescription().length()) {
     dst->AddStringAttribute(ui::AX_ATTR_DESCRIPTION,
                             UTF16ToUTF8(src.accessibilityDescription()));
   }
   if (src.hasComputedStyle()) {
     dst->AddStringAttribute(ui::AX_ATTR_DISPLAY,
                             UTF16ToUTF8(src.computedStyleDisplay()));
   }
   if (src.helpText().length())
     dst->AddStringAttribute(ui::AX_ATTR_HELP, UTF16ToUTF8(src.helpText()));
+  if (src.placeholder().length()) {
+    dst->AddStringAttribute(ui::AX_ATTR_PLACEHOLDER,
+                            UTF16ToUTF8(src.placeholder()));
+  }
   if (src.keyboardShortcut().length()) {
     dst->AddStringAttribute(ui::AX_ATTR_SHORTCUT,
                             UTF16ToUTF8(src.keyboardShortcut()));
   }
   if (!src.titleUIElement().isDetached()) {
     dst->AddIntAttribute(ui::AX_ATTR_TITLE_UI_ELEMENT,
                          src.titleUIElement().axID());
   }
   if (!src.ariaActiveDescendant().isDetached()) {
     dst->AddIntAttribute(ui::AX_ATTR_ACTIVEDESCENDANT_ID,
@@ skipping 268 matching lines @@
     AddIntListAttributeFromWebObjects(ui::AX_ATTR_OWNS_IDS, owns, dst);
 }
 
 blink::WebDocument BlinkAXTreeSource::GetMainDocument() const {
   if (render_frame_ && render_frame_->GetWebFrame())
     return render_frame_->GetWebFrame()->document();
   return WebDocument();
 }
 
 }  // namespace content