Fixes for contenteditable caret and selection handling in 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 f5ca8ecd9d2ec2bf42ca8f37e200e90b3156dd9c..7bd543dc68d406f59309cd7af7cd6c57f781d678 100644
--- a/content/browser/accessibility/browser_accessibility_win.h
+++ b/content/browser/accessibility/browser_accessibility_win.h
@@ -775,6 +775,15 @@ BrowserAccessibilityWin
   int32 GetHypertextOffsetFromDescendant(
       const BrowserAccessibilityWin& descendant) const;
 
+  // If the selection endpoint is either equal to or an ancestor of this object,

[dmazzoni, 2015/09/30 20:09:56]

Comment should mention when it returns -1 and why

+  // returns endpoint_offset.
+  // If the selection endpoint is a descendant of this object, returns its
+  // embedded character offset. Otherwise, returns either 0 or the length of the
+  // hypertext, depending on the direction of the selection.
+  int GetHypertextOffsetFromEndpoint(
+      const BrowserAccessibilityWin& endpoint_object,
+      int endpoint_offset) const;
+
   // The following functions retrieve the endpoints of the current selection.
   // First they checks for a local selection found on the current control, e.g.
   // when querying the selection on a textarea.
@@ -795,7 +804,7 @@ BrowserAccessibilityWin
 
   // Get the text of this node for the purposes of IAccessibleText - it may
   // be the name, it may be the value, etc. depending on the role.
-  base::string16 TextForIAccessibleText();
+  base::string16 TextForIAccessibleText() const;
 
   bool IsSameHypertextCharacter(size_t old_char_index, size_t new_char_index);
   void ComputeHypertextRemovedAndInserted(