Implement accessibility support for CSS-transformed iframes.

third_party/WebKit/Source/modules/accessibility/AXObject.h

 /*
  * Copyright (C) 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nuanti Ltd.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 21 matching lines @@
 
 #include "core/editing/VisiblePosition.h"
 #include "modules/ModulesExport.h"
 #include "platform/geometry/FloatQuad.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/Color.h"
 #include "platform/inspector_protocol/TypeBuilder.h"
 #include "wtf/Forward.h"
 #include "wtf/Vector.h"
 
+class SkMatrix44;
+
 namespace blink {
 
 class AXObject;
 class AXObjectCache;
 class AXObjectCacheImpl;
 class Element;
 class FrameView;
 class IntPoint;
 class NameSource;
 class Node;
@@ skipping 734 matching lines @@
     const AtomicString& containerLiveRegionRelevant() const;
     bool containerLiveRegionAtomic() const;
     bool containerLiveRegionBusy() const;
 
     // Location and click point in frame-relative coordinates.
     virtual LayoutRect elementRect() const { return m_explicitElementRect; }
     void setElementRect(LayoutRect r) { m_explicitElementRect = r; }
     virtual void markCachedElementRectDirty() const;
     virtual IntPoint clickPoint();
 
+    // Transformation relative to the parent frame, if local (otherwise returns identity).
+    virtual SkMatrix44 transformFromLocalParentFrame() const;
+
     // Hit testing.
     // Called on the root AX object to return the deepest available element.
     virtual AXObject* accessibilityHitTest(const IntPoint&) const { return 0; }
     // Called on the AX object after the layout tree determines which is the right AXLayoutObject.
     virtual AXObject* elementAccessibilityHitTest(const IntPoint&) const;
 
     // High-level accessibility tree access. Other modules should only use these functions.
     const AXObjectVector& children();
     AXObject* parentObject() const;
     AXObject* parentObjectIfExists() const;
@@ skipping 144 matching lines @@
 #define DEFINE_AX_OBJECT_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, AXObject, object, object->predicate, object.predicate)
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::IgnoredReason);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::NameSource);
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::DescriptionSource);
 
 #endif // AXObject_h