Add supports that allow Autofill to be initiated from textarea field

components/autofill/content/renderer/form_cache.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_CACHE_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_CACHE_H_
 
 #include <map>
 #include <set>
 #include <vector>
 
 #include "base/strings/string16.h"
 
 namespace blink {
 class WebDocument;
+class WebFormControlElement;
 class WebFormElement;
 class WebFrame;
 class WebInputElement;
 class WebSelectElement;
 }
 
 namespace autofill {
 
 struct FormData;
 struct FormDataPredictions;
@@ skipping 17 matching lines @@
       const blink::WebFrame& frame,
       size_t minimum_required_fields,
       std::vector<FormData>* forms,
       std::vector<blink::WebFormElement>* web_form_elements);
 
   // Resets the forms for the specified |frame|.
   void ResetFrame(const blink::WebFrame& frame);
 
   // Clears the values of all input elements in the form that contains
   // |element|.  Returns false if the form is not found.
-  bool ClearFormWithElement(const blink::WebInputElement& element);
+  bool ClearFormWithElement(const blink::WebFormControlElement& element);
 
   // For each field in the |form|, sets the field's placeholder text to the
   // field's overall predicted type.  Also sets the title to include the field's
   // heuristic type, server type, and signature; as well as the form's signature
   // and the experiment id for the server predictions.
   bool ShowPredictions(const FormDataPredictions& form);
 
  private:
   // The cached web frames.
   std::set<blink::WebDocument> web_documents_;
 
   // The cached initial values for <select> elements.
   std::map<const blink::WebSelectElement, base::string16>
       initial_select_values_;
 
   // The cached initial values for checkable <input> elements.
   std::map<const blink::WebInputElement, bool> initial_checked_state_;
 
   DISALLOW_COPY_AND_ASSIGN(FormCache);
 };
 
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_CACHE_H_