Implement accessibility support for CSS-transformed iframes.

third_party/WebKit/Source/web/WebAXObject.cpp

Index: third_party/WebKit/Source/web/WebAXObject.cpp
diff --git a/third_party/WebKit/Source/web/WebAXObject.cpp b/third_party/WebKit/Source/web/WebAXObject.cpp
index 4445b63bb9c56609ac56b5dffba20f9e3c34ab55..4df47cd978ddfc506526aba686a3aaa18bfa71b2 100644
--- a/third_party/WebKit/Source/web/WebAXObject.cpp
+++ b/third_party/WebKit/Source/web/WebAXObject.cpp
@@ -30,6 +30,7 @@
 
 #include "public/web/WebAXObject.h"
 
+#include "SkMatrix44.h"
 #include "core/HTMLNames.h"
 #include "core/css/CSSPrimitiveValueMappings.h"
 #include "core/dom/Document.h"
@@ -1506,6 +1507,14 @@ void WebAXObject::scrollToGlobalPoint(const WebPoint& point) const
         m_private->scrollToGlobalPoint(point);
 }
 
+SkMatrix44 WebAXObject::transformFromLocalParentFrame() const
+{
+    if (isDetached())
+        return SkMatrix44();
+
+    return m_private->transformFromLocalParentFrame();
+}
+
 WebAXObject::WebAXObject(AXObject* object)
     : m_private(object)
 {