Add option to not dump childrens of a node in AX Tree.

content/browser/accessibility/browser_accessibility.cc

 // Copyright (c) 2012 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.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 33 matching lines @@
 }
 
 bool BrowserAccessibility::PlatformIsLeaf() const {
   if (InternalChildCount() == 0)
     return true;
 
   // All of these roles may have children that we use as internal
   // implementation details, but we want to expose them as leaves
   // to platform accessibility APIs.
   switch (GetRole()) {
+    case ui::AX_ROLE_DATE:

[dmazzoni, 2015/01/13 22:34:49]

Making the change here will actually make these controls inaccessible, it will
hide the important sub-controls from the platform.

Instead, we should just add a feature that allows tests to specify that children
shouldn't be dumped of a specific element.

We already have support for @NO_DUMP, which is used in tests like
button-name-calc.html and implemented in accessibility_tree_formatter.cc.

How about a new marker @NO_DUMP_CHILDREN that dumps that one node but not its
children?

+    case ui::AX_ROLE_DATE_TIME:
     case ui::AX_ROLE_LINE_BREAK:
     case ui::AX_ROLE_SLIDER:
     case ui::AX_ROLE_STATIC_TEXT:
+    case ui::AX_ROLE_TIME:
     case ui::AX_ROLE_TEXT_AREA:
     case ui::AX_ROLE_TEXT_FIELD:
       return true;
     default:
       return false;
   }
 }
 
 uint32 BrowserAccessibility::PlatformChildCount() const {
   return PlatformIsLeaf() ? 0 : InternalChildCount();
@@ skipping 644 matching lines @@
   if (GetRole() == ui::AX_ROLE_STATIC_TEXT)
     return static_cast<int>(GetStringAttribute(ui::AX_ATTR_VALUE).size());
 
   int len = 0;
   for (size_t i = 0; i < InternalChildCount(); ++i)
     len += InternalGetChild(i)->GetStaticTextLenRecursive();
   return len;
 }
 
 }  // namespace content