Expose InlineTextBoxes in the accessibility tree.

LayoutTests/platform/linux/accessibility/inline-text-bounds-for-range-expected.txt

Index: LayoutTests/platform/linux/accessibility/inline-text-bounds-for-range-expected.txt
diff --git a/LayoutTests/platform/linux/accessibility/inline-text-bounds-for-range-expected.txt b/LayoutTests/platform/linux/accessibility/inline-text-bounds-for-range-expected.txt
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index 0000000000000000000000000000000000000000..d1024c86c494c5a7c87899ac0577754ef845a2b7
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+The Hitchhiker's Guide to the Galaxy has a few things to say on the subject of resumés. A resumé, it says, is about the most massively useful thing an interstellar hitch hiker can have.
+
+Tests that we can compute the bounds of a range of text from the accessibility tree.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS text.length is 185
+Accessible text: "The Hitchhiker's Guide to the Galaxy has a few things to say on the subject of resumés. A resumé, it says, is about the most massively useful thing an interstellar hitch hiker can have."
+PASS appendedInlineText is text
+
+Testing bounds of word: The
+PASS axBounds.x is within 1 of 8
+PASS axBounds.y is within 1 of 8
+PASS axBounds.width is within 1 of 23
+PASS axBounds.height is within 1 of 19
+
+Testing bounds of word: Hitchhiker
+PASS axBounds.x is within 1 of 35
+PASS axBounds.y is within 1 of 8
+PASS axBounds.width is within 1 of 62
+PASS axBounds.height is within 1 of 19
+
+Testing bounds of word: Guide
+PASS axBounds.x is within 1 of 110
+PASS axBounds.y is within 1 of 8
+PASS axBounds.width is within 1 of 36
+PASS axBounds.height is within 1 of 19
+
+Testing bounds of word: interstellar
+PASS axBounds.x is within 1 of 8
+PASS axBounds.y is within 1 of 48
+PASS axBounds.width is within 1 of 61
+PASS axBounds.height is within 1 of 19
+PASS successfullyParsed is true
+
+TEST COMPLETE
+