Add WebScopedAXContext to allow a one-time snapshot of accessibility.

Source/web/WebAXObject.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "public/web/WebAXObject.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/CSSPrimitiveValueMappings.h"
-#include "core/dom/AXObjectCache.h"
 #include "core/dom/Document.h"
 #include "core/dom/Node.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/PinchViewport.h"
 #include "core/layout/LayoutView.h"
 #include "core/style/ComputedStyle.h"
 #include "core/page/EventHandler.h"
 #include "core/page/Page.h"
 #include "modules/accessibility/AXObject.h"
+#include "modules/accessibility/AXObjectCacheImpl.h"
 #include "modules/accessibility/AXTable.h"
 #include "modules/accessibility/AXTableCell.h"
 #include "modules/accessibility/AXTableColumn.h"
 #include "modules/accessibility/AXTableRow.h"
 #include "platform/PlatformKeyboardEvent.h"
 #include "public/platform/WebPoint.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebString.h"
 #include "public/platform/WebURL.h"
 #include "public/web/WebDocument.h"
 #include "public/web/WebNode.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 #if ENABLE(ASSERT)
 // It's not safe to call some WebAXObject APIs if a layout is pending.
 // Clients should call updateLayoutAndCheckValidity first.
 static bool isLayoutClean(Document* document)
 {
     if (!document || !document->view())
         return false;
     return document->lifecycle().state() >= DocumentLifecycle::LayoutClean
         || (document->lifecycle().state() == DocumentLifecycle::StyleClean && !document->view()->needsLayout());
 }
 #endif
 
+WebScopedAXContext::WebScopedAXContext(WebDocument& rootDocument)
+    : m_private(adoptRef(new ScopedAXObjectCache(*rootDocument.unwrap<Document>())))
+{
+}
+
+WebScopedAXContext::~WebScopedAXContext()
+{
+    m_private.reset();
+}
+
+WebAXObject WebScopedAXContext::root() const
+{
+    return WebAXObject(static_cast<AXObjectCacheImpl*>(m_private->get())->root());
+}
+
 void WebAXObject::reset()
 {
     m_private.reset();
 }
 
 void WebAXObject::assign(const WebAXObject& other)
 {
     m_private = other.m_private;
 }
 
@@ skipping 1336 matching lines @@
     m_private = object;
     return *this;
 }
 
 WebAXObject::operator WTF::PassRefPtr<AXObject>() const
 {
     return m_private.get();
 }
 
 } // namespace blink