Avoid requiring a recalc to update compositing state for iframes

LayoutTests/platform/mac/fast/repaint/line-flow-with-floats-8-expected.txt

Index: LayoutTests/platform/mac/fast/repaint/line-flow-with-floats-8-expected.txt
diff --git a/LayoutTests/platform/mac/fast/repaint/line-flow-with-floats-8-expected.txt b/LayoutTests/platform/mac/fast/repaint/line-flow-with-floats-8-expected.txt
index 9310dccde8882ab12b8ce98d2afd3bc215eae93c..1a0164fc03799c0734be17aa1635e4107005f641 100644
--- a/LayoutTests/platform/mac/fast/repaint/line-flow-with-floats-8-expected.txt
+++ b/LayoutTests/platform/mac/fast/repaint/line-flow-with-floats-8-expected.txt
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