AutoFill fills only clicked field when form was filled prior.

chrome/renderer/render_view.h

 // Copyright (c) 2010 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 CHROME_RENDERER_RENDER_VIEW_H_
 #define CHROME_RENDERER_RENDER_VIEW_H_
 
 #include <deque>
 #include <map>
 #include <queue>
@@ skipping 571 matching lines @@
   FRIEND_TEST(RenderViewTest, PrintWithIframe);
   FRIEND_TEST(RenderViewTest, PrintLayoutTest);
   FRIEND_TEST(RenderViewTest, OnHandleKeyboardEvent);
   FRIEND_TEST(RenderViewTest, InsertCharacters);
 #if defined(OS_MACOSX)
   FRIEND_TEST(RenderViewTest, MacTestCmdUp);
 #endif
   FRIEND_TEST(RenderViewTest, JSBlockSentAfterPageLoad);
   FRIEND_TEST(RenderViewTest, UpdateTargetURLWithInvalidURL);
   FRIEND_TEST(RenderViewTest, SendForms);
+  FRIEND_TEST(RenderViewTest, FillFormElement);
 
   typedef std::map<GURL, ContentSettings> HostContentSettings;
   typedef std::map<GURL, int> HostZoomLevels;
 
   enum AutoFillAction {
     AUTOFILL_NONE,    // No state set.
     AUTOFILL_FILL,    // Fill the AutoFill form data.
     AUTOFILL_PREVIEW, // Preview the AutoFill form data.
   };
 
@@ skipping 671 matching lines @@
   // ADDING NEW DATA? Please see if it fits appropriately in one of the above
   // sections rather than throwing it randomly at the end. If you're adding a
   // bunch of stuff, you should probably create a helper class and put your
   // data and methods on that to avoid bloating RenderView more.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderView);
 };
 
 #endif  // CHROME_RENDERER_RENDER_VIEW_H_