Expose InlineTextBoxes in the accessibility tree.

LayoutTests/accessibility/inline-text-changes-expected.txt

Index: LayoutTests/accessibility/inline-text-changes-expected.txt
diff --git a/LayoutTests/accessibility/inline-text-changes-expected.txt b/LayoutTests/accessibility/inline-text-changes-expected.txt
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+This paragraph contains two lines of text. One more sentence.
+
+Tests that accessible inline text boxes update immediately when a static text element changes.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS axStaticText.childrenCount is 2
+PASS axInlineBefore0.stringValue is 'AXValue: This paragraph contains '
+PASS axInlineBefore1.stringValue is 'AXValue: two lines of text.'
+PASS axStaticText.childrenCount is 3
+PASS axInlineAfter0.stringValue is 'AXValue: This paragraph contains '
+PASS axInlineAfter1.stringValue is 'AXValue: two lines of text. One '
+PASS axInlineAfter2.stringValue is 'AXValue: more sentence.'
+PASS axInlineBefore1.stringValue is 'AXValue: '
+PASS successfullyParsed is true
+
+TEST COMPLETE
+