Expose InlineTextBoxes in the accessibility tree.

Source/core/accessibility/AccessibilityObject.h

Index: Source/core/accessibility/AccessibilityObject.h
diff --git a/Source/core/accessibility/AccessibilityObject.h b/Source/core/accessibility/AccessibilityObject.h
index 6c27e5c791a4455af5c886413e11a8bd955b8fa9..b8466839bcb23a13b094fe89c12ff0e4c1185c7b 100644
--- a/Source/core/accessibility/AccessibilityObject.h
+++ b/Source/core/accessibility/AccessibilityObject.h
@@ -101,6 +101,7 @@ enum AccessibilityRole {
     ImageMapRole,
     ImageRole,
     IncrementorRole,
+    InlineTextBoxRole,
     LabelRole,
     LegendRole,
     LinkRole,
@@ -242,6 +243,13 @@ enum AccessibilityButtonState {
     ButtonStateMixed,
 };
 
+enum AccessibilityTextDirection {
+    AccessibilityTextDirectionLR,
+    AccessibilityTextDirectionRL,
+    AccessibilityTextDirectionTB,
+    AccessibilityTextDirectionBT
+};
+
 struct VisiblePositionRange {
 
     VisiblePosition start;
@@ -411,6 +419,13 @@ public:
     virtual AccessibilityObject* titleUIElement() const { return 0; }
     virtual KURL url() const { return KURL(); }
 
+    // For an inline text box.
+    virtual AccessibilityTextDirection textDirection() const { return AccessibilityTextDirectionLR; }
+    // The integer horizontal pixel offset of each character in the string; negative values for RTL.
+    virtual void textCharacterOffsets(Vector<int>&) const { }
+    // The start and end character offset of each word in the inline text box.
+    virtual void wordBoundaries(Vector<PlainTextRange>& words) const { }
+
     // Properties of interactive elements.
     virtual String actionVerb() const;
     virtual AccessibilityButtonState checkboxOrRadioValue() const;