Forward BrowserAccessibilityWin::get_accName to platform node.

ui/accessibility/platform/ax_platform_node_win.cc

 // Copyright 2015 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 <atlbase.h>
 #include <atlcom.h>
 #include <limits.h>
 #include <oleacc.h>
 #include <stdint.h>
 
@@ skipping 456 matching lines @@
   COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, acc_key, target);
 
   return target->GetStringAttributeAsBstr(ui::AX_ATTR_SHORTCUT, acc_key);
 }
 
 STDMETHODIMP AXPlatformNodeWin::get_accName(
     VARIANT var_id, BSTR* name) {
   AXPlatformNodeWin* target;
   COM_OBJECT_VALIDATE_VAR_ID_1_ARG_AND_GET_TARGET(var_id, name, target);
 
-  return target->GetStringAttributeAsBstr(ui::AX_ATTR_NAME, name);
+  HRESULT result = target->GetStringAttributeAsBstr(ui::AX_ATTR_NAME, name);
+  if (FAILED(result) && MSAARole() == ROLE_SYSTEM_DOCUMENT && GetParent()) {
+    // Hack: Some versions of JAWS crash if they get an empty name on
+    // a document that's the child of an iframe, so always return a
+    // nonempty string for this role.  https://crbug.com/583057
+    base::string16 str = L" ";
+
+    *name = SysAllocString(str.c_str());
+    DCHECK(*name);
+  }
+  return result;
 }
 
 STDMETHODIMP AXPlatformNodeWin::get_accParent(
     IDispatch** disp_parent) {
   COM_OBJECT_VALIDATE_1_ARG(disp_parent);
   *disp_parent = GetParent();
   if (*disp_parent) {
     (*disp_parent)->AddRef();
     return S_OK;
   }
@@ skipping 793 matching lines @@
 
   AXPlatformNodeBase* base =
       FromNativeViewAccessible(node->GetNativeViewAccessible());
   if (base && !IsDescendant(base))
     base = nullptr;
 
   return static_cast<AXPlatformNodeWin*>(base);
 }
 
 }  // namespace ui