Implement aria-placeholder

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

Index: third_party/WebKit/Source/modules/accessibility/AXNodeObject.h
diff --git a/third_party/WebKit/Source/modules/accessibility/AXNodeObject.h b/third_party/WebKit/Source/modules/accessibility/AXNodeObject.h
index 4ade91bdd8b8add9219feb7ae8bf2c12b20e3259..327773d2f100929c86291944f348d402dedd79b4 100644
--- a/third_party/WebKit/Source/modules/accessibility/AXNodeObject.h
+++ b/third_party/WebKit/Source/modules/accessibility/AXNodeObject.h
@@ -175,7 +175,7 @@ class MODULES_EXPORT AXNodeObject : public AXObject {
                      AXDescriptionFrom&,
                      DescriptionSources*,
                      AXRelatedObjectVector*) const override;
-  String placeholder(AXNameFrom, AXDescriptionFrom) const override;
+  String placeholder(AXNameFrom) const override;
   bool nameFromLabelElement() const override;
 
   // Location
@@ -234,6 +234,7 @@ class MODULES_EXPORT AXNodeObject : public AXObject {
                                bool* foundTextAlternative) const;
   float stepValueForRange() const;
   bool isDescendantOfElementType(const HTMLQualifiedName& tagName) const;
+  String placeholderFromNativeAttribute() const;
 };
 
 }  // namespace blink