Add/remove spell checking markers in text inputs depending on focus.

LayoutTests/editing/spelling/markers-input-type-text-expected.txt

Index: LayoutTests/editing/spelling/markers-input-type-text-expected.txt
diff --git a/LayoutTests/editing/spelling/markers-input-type-text-expected.txt b/LayoutTests/editing/spelling/markers-input-type-text-expected.txt
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+Markers in text inputs should only be visible if an input is being edited but removing markers from the input must not touch other markers.When testing manually type something misspelled in the first textarea, focus the text input and type something with misspellings there too.Then focus the second text area. Mispelling marks should be removed from the inputbut not for the first textarea. Focus the input again - misspelling marks should be restored.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
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+
+PASS successfullyParsed is true
+
+TEST COMPLETE
+PASS internals.markerCountForNode(findFirstTextNode(testTextArea), "spelling") is 1
+PASS internals.markerCountForNode(findFirstTextNode(testInput), "spelling") is 4
+PASS internals.markerCountForNode(findFirstTextNode(testInput), "spelling") is 0
+PASS internals.markerCountForNode(findFirstTextNode(testTextArea), "spelling") is 1
+PASS internals.markerCountForNode(findFirstTextNode(testInput), "spelling") is 4
+PASS internals.markerCountForNode(findFirstTextNode(testTextArea), "spelling") is 1
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