Bug 1524220 - Mark 'document.documentElement.clientHeight + 200' test case fail. r=heycam

All of failure test cases in root-margin.html will be fixed by this PR
web-platform-tests/wpt#15254 .

Differential Revision: https://phabricator.services.mozilla.com/D18760

UltraBlame original commit: 241a3659869bd944111ee48233ba27ceb2040af7

Author: marco-c

testing/web-platform/meta/intersection-observer/root-margin.html.ini

@@ -54,6 +54,32 @@ documentElement
 .
 clientHeight
 +
+200
+]
+expected
+:
+if
+os
+=
+=
+"
+android
+"
+:
+FAIL
+[
+document
+.
+scrollingElement
+.
+scrollTop
+=
+document
+.
+documentElement
+.
+clientHeight
++
 300
 ]
 expected