[Autofill/Autocomplete Feature] Substring matching instead of prefix matching.

components/autofill/content/renderer/form_autofill_util.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_AUTOFILL_UTIL_H_
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_AUTOFILL_UTIL_H_
 
 #include <vector>
 
 #include "base/strings/string16.h"
@@ skipping 158 matching lines @@
 // Meta, script and title tags don't influence the emptiness of a webpage.
 bool IsWebpageEmpty(const blink::WebFrame* frame);
 
 // This function checks whether the children of |element|
 // are of the type <script>, <meta>, or <title>.
 bool IsWebElementEmpty(const blink::WebElement& element);
 
 // Return a gfx::RectF that is the bounding box for |element| scaled by |scale|.
 gfx::RectF GetScaledBoundingBox(float scale, blink::WebElement* element);
 
+// Previews |suggestion| in |input_element| and highlights the suffix of
+// |suggestion| not included in the |input_element| text. |input_element| must
+// not be null. |user_input| should be the text typed by the user into
+// |input_element|. Note that |user_input| cannot be easily derived from
+// |input_element| by calling value(), because of http://crbug.com/507714.
+void PreviewSuggestion(const base::string16& suggestion,
+                       const base::string16& user_input,
+                       blink::WebFormControlElement* input_element);
+
 }  // namespace autofill
 
 #endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_FORM_AUTOFILL_UTIL_H_