Use text affinity to return correct accessible line boundaries.

content/browser/accessibility/browser_accessibility.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 #define CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 148 matching lines @@
   // the role is WebAXRoleStaticText.
   gfx::Rect GetGlobalBoundsForRange(int start, int len) const;
 
   // This is to handle the cases such as ARIA textbox, where the value should
   // be calculated from the object's inner text.
   virtual base::string16 GetValue() const;
 
   // Starting at the given character offset, locates the start of the next or
   // previous line and returns its character offset.
   int GetLineStartBoundary(int start,
-                           ui::TextBoundaryDirection direction) const;
+                           ui::TextBoundaryDirection direction,
+                           ui::AXTextAffinity affinity) const;
 
   // Starting at the given character offset, locates the start of the next or
   // previous word and returns its character offset.
   // In case there is no word boundary before or after the given offset, it
   // returns one past the last character.
   // If the given offset is already at the start of a word, returns the start
   // of the next word if the search is forwards, and the given offset if it is
   // backwards.
   // If the start offset is equal to -1 and the search is in the forwards
   // direction, returns the start boundary of the first word.
@@ skipping 189 matching lines @@
   // its nearest scrollable ancestor) to local bounds (which are relative
   // to the top of the web accessibility tree).
   gfx::Rect ElementBoundsToLocalBounds(gfx::Rect bounds) const;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserAccessibility);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ACCESSIBILITY_BROWSER_ACCESSIBILITY_H_