Move common methods to WebFormControlElement interface

public/web/WebFormControlElement.h

Index: public/web/WebFormControlElement.h
diff --git a/public/web/WebFormControlElement.h b/public/web/WebFormControlElement.h
index e771d3cb4a8c0d97d84c4c983f669b32e17b1a4b..a6883613b22c25438d3496d08f95dd53c07709e6 100644
--- a/public/web/WebFormControlElement.h
+++ b/public/web/WebFormControlElement.h
@@ -64,20 +64,43 @@ public:
     BLINK_EXPORT bool isAutofilled() const;
     BLINK_EXPORT void setAutofilled(bool);
 
-    // This returns the non-sanitized, exact value inside the text input field
+    // Returns true if autocomplete attribute of the element is not set as "off".
+    BLINK_EXPORT bool autoComplete() const;
+
+    // Sets value for input element, textarea element and select element. For select
+    // element it finds the option with value matches the given parameter and make the
+    // option as the current selection.
+    BLINK_EXPORT void setValue(const WebString&, bool sendChangeEvent = false);
+    // Returns value of element. For select element, it returns the value of
+    // the selected option if present. If no selected option, an empty string
+    // is returned. For any other types of elements, a null string is returned.
+    BLINK_EXPORT WebString value() const;
+    // Sets suggested value for element. The goal of introducing suggested value
+    // is to not leak any information to JavaScript.
+    BLINK_EXPORT void setSuggestedValue(const WebString&);
+    // Returns suggested value for input element or textarea element. If neither
+    // input element nor textarea element, a null string is returned.
+    BLINK_EXPORT WebString suggestedValue() const;
+
+    // Returns the non-sanitized, exact value inside the text input field
     // or insisde the textarea. If neither input element nor textarea element,
     // a null string is returned.
     BLINK_EXPORT WebString editingValue() const;
 
-    // The returned value represents a cursor/caret position at the current
+    // Sets character selection range.
+    BLINK_EXPORT void setSelectionRange(int start, int end);
+    // Returned value represents a cursor/caret position at the current
     // selection's start for text input field or textarea. If neither input
     // element nor textarea element, 0 is returned.
     BLINK_EXPORT int selectionStart() const;
-    // The returned value represents a cursor/caret position at the current
+    // Returned value represents a cursor/caret position at the current
     // selection's end for text input field or textarea. If neither input
     // element nor textarea element, 0 is returned.
     BLINK_EXPORT int selectionEnd() const;
 
+    // Returns direction of text of element.
+    BLINK_EXPORT WebString directionForFormData() const;
+
     // Returns the name that should be used for the specified |element| when
     // storing autofill data.  This is either the field name or its id, an empty
     // string if it has no name and no id.