Mark hittesting/inline-with-clip-path.html as flaky

TBR=schenney@chromium.org

Bug: 807159
Change-Id: Id49b4c6e72e8a7226f27c4577195131da699cc36
Reviewed-on: https://chromium-review.googlesource.com/892588Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532804}

third_party/WebKit/LayoutTests/TestExpectations

@@ -3327,6 +3327,8 @@ crbug.com/783154 [ Mac ] virtual/modern-media-controls/media/controls/modern/dou
 
 crbug.com/802915 css3/blending/isolation-should-include-non-local-background.html [ Failure ]
 
+crbug.com/807159 hittesting/inline-with-clip-path.html [ Pass Crash ]
+
 # Sheriff faulures 2017-12-12
 crbug.com/794180 http/tests/devtools/layers/layer-compositing-reasons.js [ Failure Pass ]