Add support for retrieving image thumbnails as part of the accessibility tree.

third_party/WebKit/public/web/WebAXObject.h

 /*
  * 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 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebAXObject_h
 #define WebAXObject_h
 
 #include "../platform/WebCommon.h"
 #include "../platform/WebPoint.h"
 #include "../platform/WebPrivatePtr.h"
+#include "../platform/WebSize.h"
 #include "../platform/WebVector.h"
 #include "WebAXEnums.h"
 #include <memory>
 
 #if BLINK_IMPLEMENTATION
 namespace WTF {
 template <typename T>
 class PassRefPtr;
 }
 #endif
 
 class SkMatrix44;
 
 namespace blink {
 
 class AXObject;
 class ScopedAXObjectCache;
 class WebAXObject;
 class WebNode;
 class WebDocument;
 class WebString;
 class WebURL;
 struct WebFloatRect;
 struct WebPoint;
 struct WebRect;
+struct WebSize;
 
 // An instance of this class, while kept alive, indicates that accessibility
 // should be temporarily enabled. If accessibility was enabled globally
 // (WebSettings::setAccessibilityEnabled), this will have no effect.
 class WebScopedAXContext {
  public:
   BLINK_EXPORT WebScopedAXContext(WebDocument& rootDocument);
   BLINK_EXPORT ~WebScopedAXContext();
 
   BLINK_EXPORT WebAXObject root() const;
@@ skipping 77 matching lines @@
   BLINK_EXPORT WebAXAriaCurrentState ariaCurrentState() const;
   BLINK_EXPORT bool ariaFlowTo(WebVector<WebAXObject>& flowToElements) const;
   BLINK_EXPORT bool ariaHasPopup() const;
   BLINK_EXPORT bool isEditable() const;
   BLINK_EXPORT bool isMultiline() const;
   BLINK_EXPORT bool isRichlyEditable() const;
   BLINK_EXPORT bool ariaOwns(WebVector<WebAXObject>& ownsElements) const;
   BLINK_EXPORT WebString fontFamily() const;
   BLINK_EXPORT float fontSize() const;
   BLINK_EXPORT bool canvasHasFallbackContent() const;
+  // If this is an image, returns the image (scaled to maxSize) as a data url.
+  BLINK_EXPORT WebString imageDataUrl(const WebSize& maxSize) const;
   BLINK_EXPORT WebAXInvalidState invalidState() const;
   // Only used when invalidState() returns WebAXInvalidStateOther.
   BLINK_EXPORT WebString ariaInvalidValue() const;
   BLINK_EXPORT double estimatedLoadingProgress() const;
   BLINK_EXPORT int headingLevel() const;
   BLINK_EXPORT int hierarchicalLevel() const;
   BLINK_EXPORT WebAXObject hitTest(const WebPoint&) const;
   BLINK_EXPORT WebString keyboardShortcut() const;
   BLINK_EXPORT WebString language() const;
   BLINK_EXPORT WebAXOrientation orientation() const;
@@ skipping 171 matching lines @@
   operator AXObject*() const;
 #endif
 
  private:
   WebPrivatePtr<AXObject> m_private;
 };
 
 }  // namespace blink
 
 #endif