Separating ARIA, HTML & event AX test.

content/test/data/accessibility/readme.txt

Index: content/test/data/accessibility/readme.txt
diff --git a/content/test/data/accessibility/readme.txt b/content/test/data/accessibility/readme.txt
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-DumpAccessibilityTreeTest Notes
-
-Files used:
-* foo.html -- a file to be tested
-* foo-expected-win.txt -- expected MSAA output
-* foo-expected-mac.txt -- expected Mac accessibility output
-
-Format for expected files:
-* Blank lines and lines beginning with # are ignored
-* Skipped files: if first line of file begins with #<skip then the entire file is ignored,
-  but listed in the output as skipped
-* Use 4 spaces for indent to show hierarchy
-* MSAA states do not have a prefix, e.g. FOCUSED, not STATE_SYSTEM_FOCUSED
-* All other constants are used exactly as normally named
-* See specific examples (e.g. ul-expected-win.txt) for more details
-
-Running the tests:
-browser_tests --gtest_filter="DumpAccessibilityTreeTest*"