Fix accessibility in Windows x64 build.

ui/views/accessibility/native_view_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 "ui/views/accessibility/native_view_accessibility_win.h"
 
 #include <oleacc.h>
 #include <UIAutomationClient.h>
 
 #include <set>
@@ skipping 12 matching lines @@
 #include "ui/base/win/atl_module.h"
 #include "ui/views/controls/button/custom_button.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/focus/view_storage.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/win/hwnd_util.h"
 
 namespace views {
 namespace {
 
+// A version of the OBJID_CLIENT constant that works in 64-bit mode too.
+static const LPARAM kObjIdClient = static_cast<ULONG>(OBJID_CLIENT);
+
 class AccessibleWebViewRegistry {
  public:
   static AccessibleWebViewRegistry* GetInstance();
 
   void RegisterWebView(View* web_view);
 
   void UnregisterWebView(View* web_view);
 
   // Given the view that received the request for the accessible
   // id in |top_view|, and the child id requested, return the native
@@ skipping 737 matching lines @@
   return E_NOTIMPL;
 }
 
 STDMETHODIMP NativeViewAccessibilityWin::accSelect(
     LONG flagsSelect, VARIANT var_id) {
   return E_NOTIMPL;
 }
 
 STDMETHODIMP NativeViewAccessibilityWin::get_accHelp(
     VARIANT var_id, BSTR* help) {
-  if (help)
-    *help = NULL;
-  return E_NOTIMPL;
+  base::string16 temp = base::UTF8ToUTF16(view_->GetClassName());
+  *help = SysAllocString(temp.c_str());
+  return S_OK;
 }
 
 STDMETHODIMP NativeViewAccessibilityWin::get_accHelpTopic(
     BSTR* help_file, VARIANT var_id, LONG* topic_id) {
   if (help_file) {
     *help_file = NULL;
   }
   if (topic_id) {
     *topic_id = static_cast<LONG>(-1);
   }
@@ skipping 691 matching lines @@
     if (view == NULL || view == view_) {
       alert_target_view_storage_ids_.erase(
           alert_target_view_storage_ids_.begin() + i);
     } else {
       ++i;
     }
   }
 }
 
 }  // namespace views