Implemented SetSelection for the Web content on Windows.

content/browser/accessibility/browser_accessibility_win.h

Index: content/browser/accessibility/browser_accessibility_win.h
diff --git a/content/browser/accessibility/browser_accessibility_win.h b/content/browser/accessibility/browser_accessibility_win.h
index 30af849e26bcd596fd9449eaca97388b14ff83ca..16956fb4c5526c37aa4d8ecbbc34626acb4104b0 100644
--- a/content/browser/accessibility/browser_accessibility_win.h
+++ b/content/browser/accessibility/browser_accessibility_win.h
@@ -743,6 +743,11 @@ BrowserAccessibilityWin
     return win_attributes_->hyperlinks;
   }
 
+ protected:
+  // |offset| could either be a text character or a child index in case of
+  // non-text objects.
+  AXPlatformPositionInstance CreatePositionAt(int offset) const override;
+
  private:
   // Returns the IA2 text attributes for this object.
   std::vector<base::string16> ComputeTextAttributes() const;
@@ -783,6 +788,9 @@ BrowserAccessibilityWin
   FRIEND_TEST_ALL_PREFIXES(BrowserAccessibilityTest,
                            TestSanitizeStringAttributeForIA2);
 
+  // Sets the selection given a start and end offset in IA2 Hypertext.
+  void SetIA2HypertextSelection(LONG start_offset, LONG end_offset);
+
   // If the string attribute |attribute| is present, add its value as an
   // IAccessible2 attribute with the name |ia2_attr|.
   void StringAttributeToIA2(ui::AXStringAttribute attribute,
@@ -858,7 +866,7 @@ BrowserAccessibilityWin
 
   // If offset is a member of IA2TextSpecialOffsets this function updates the
   // value of offset and returns, otherwise offset remains unchanged.
-  void HandleSpecialTextOffset(const base::string16& text, LONG* offset);
+  void HandleSpecialTextOffset(LONG* offset);
 
   // Convert from a IA2TextBoundaryType to a ui::TextBoundaryType.
   ui::TextBoundaryType IA2TextBoundaryToTextBoundary(IA2TextBoundaryType type);