Support presentational iframes and make use of them in the uber frame.

content/browser/accessibility/browser_accessibility_win.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_win.h"
 
 #include <UIAutomationClient.h>
 #include <UIAutomationCoreApi.h>
 
 #include "base/strings/string_number_conversions.h"
@@ skipping 3070 matching lines @@
     // Add a labelled by relationship.
     CComObject<BrowserAccessibilityRelation>* relation;
     HRESULT hr = CComObject<BrowserAccessibilityRelation>::CreateInstance(
         &relation);
     DCHECK(SUCCEEDED(hr));
     relation->AddRef();
     relation->Initialize(this, IA2_RELATION_LABELLED_BY);
     relation->AddTarget(title_elem_id);
     relations_.push_back(relation);
   }
+
+  // If this is a web area for a presentational iframe, give it a role of
+  // something other than DOCUMENT so that the fact that it's a separate doc
+  // is not exposed to AT.
+  if (IsWebAreaForPresentationalIframe()) {
+    ia_role_ = ROLE_SYSTEM_GROUPING;
+    ia2_role_ = ROLE_SYSTEM_GROUPING;
+  }
 }
 
 void BrowserAccessibilityWin::OnUpdateFinished() {
   // Construct the hypertext for this node.
   hyperlink_offset_to_index_.clear();
   hyperlinks_.clear();
   hypertext_.clear();
   for (unsigned int i = 0; i < PlatformChildCount(); ++i) {
     BrowserAccessibility* child = PlatformGetChild(i);
     if (child->GetRole() == ui::AX_ROLE_STATIC_TEXT) {
@@ skipping 442 matching lines @@
     }
     case ui::AX_ROLE_HEADING:
       role_name_ = html_tag;
       ia2_role_ = IA2_ROLE_HEADING;
       break;
     case ui::AX_ROLE_IFRAME:
       ia_role_ = ROLE_SYSTEM_DOCUMENT;
       ia2_role_ = IA2_ROLE_INTERNAL_FRAME;
       ia_state_ = STATE_SYSTEM_READONLY;
       break;
+    case ui::AX_ROLE_IFRAME_PRESENTATIONAL:
+      ia_role_ = ROLE_SYSTEM_GROUPING;
+      break;
     case ui::AX_ROLE_IMAGE:
       ia_role_ = ROLE_SYSTEM_GRAPHIC;
       ia_state_ |= STATE_SYSTEM_READONLY;
       break;
     case ui::AX_ROLE_IMAGE_MAP:
       role_name_ = html_tag;
       ia2_role_ = IA2_ROLE_IMAGE_MAP;
       ia_state_ |= STATE_SYSTEM_READONLY;
       break;
     case ui::AX_ROLE_IMAGE_MAP_LINK:
@@ skipping 268 matching lines @@
   // The role should always be set.
   DCHECK(!role_name_.empty() || ia_role_);
 
   // If we didn't explicitly set the IAccessible2 role, make it the same
   // as the MSAA role.
   if (!ia2_role_)
     ia2_role_ = ia_role_;
 }
 
 }  // namespace content