Mark...

Mark http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-gesture.html flaky on Mac

Bug: 788390
Change-Id: I2216e1c17ef9b4431d361180fe7a0d998dd807aa
Reviewed-on: https://chromium-review.googlesource.com/959385
Commit-Queue: Luna Lu <loonybear@chromium.org>
Reviewed-by: Luna Lu <loonybear@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542561}

third_party/WebKit/LayoutTests/TestExpectations

@@ -3211,10 +3211,10 @@ crbug.com/791941 [ Mac ] virtual/gpu-rasterization/images/color-profile-clip.htm
 crbug.com/791941 [ Mac ] virtual/gpu-rasterization/images/color-profile-munsell-adobe-to-srgb.html [ Pass Failure ]
 crbug.com/791941 [ Mac ] virtual/gpu-rasterization/images/color-profile-munsell-srgb-to-srgb.html [ Pass Failure ]
 
-# These tests fail often on Linux. https://crbug.com/790549
+# These tests fail often on Linux and Mac. https://crbug.com/790549
 crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-delegation.html [ Failure Pass Timeout ]
 crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-disabled.html [ Failure Pass Timeout ]
-crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-gesture.html [ Failure Pass Timeout ]
+crbug.com/788390 [ Linux Mac ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-gesture.html [ Failure Pass Timeout ]
 crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-cross-origin-feature-policy-header.html [ Failure Pass Timeout ]
 crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-feature-policy-alternating.html [ Failure Pass Timeout ]
 crbug.com/788390 [ Linux ] http/tests/media/autoplay/document-user-activation-feature-policy-iframe-no-gesture.html [ Failure Pass Timeout ]