Mark some tests flaky.

LayoutTests/TestExpectations

Index: LayoutTests/TestExpectations
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
index 9eee6bb42a7bffb0876c601e06431509c87484cf..bd127e757404702c0e3d8a9c5be17b106e9d145b 100644
--- a/LayoutTests/TestExpectations
+++ b/LayoutTests/TestExpectations
@@ -937,6 +937,19 @@ crbug.com/356997 http/tests/security/isolatedWorld/events.html [ Failure Pass ]
 crbug.com/357002 [ Linux ] http/tests/misc/cache-hit-resource-timing-buffer-full-crash.html [ Failure Pass ]
 crbug.com/357003 [ Linux Release ] inspector/elements/styles/stylesheet-source-url-comment.html [ Pass Timeout ]
 crbug.com/357004 [ Linux Mac Release ] inspector/sources/debugger/script-formatter-breakpoints-2.html [ Pass Timeout ]
+crbug.com/357068 css3/images/cross-fade-invalidation.html [ ImageOnlyFailure Pass ]
+crbug.com/357069 [ Debug ] fast/media/lifetime.html [ Crash Pass Timeout ]
+crbug.com/357071 gamepad/gamepad-polling-access.html [ Crash Pass ]
+crbug.com/357074 [ Win ] http/tests/misc/object-embedding-svg-delayed-size-negotiation-2.htm [ Pass Timeout ]
+crbug.com/357075 [ Win Release ] http/tests/security/contentSecurityPolicy/report-cross-origin-no-cookies.html [ Failure Pass ]
+crbug.com/357075 [ Win Debug ] http/tests/security/contentSecurityPolicy/report-cross-origin-no-cookies.html [ Pass Timeout ]
+crbug.com/357079 inspector/audits/audits-panel-functional.html [ Failure Pass ]
+crbug.com/357080 media/autoplay.html [ Failure Pass ]
+crbug.com/357082 [ Win Debug ] virtual/threaded/animations/animation-hit-test.html [ Failure Pass ]
+crbug.com/357084 [ Linux Win Debug ] virtual/threaded/animations/keyframe-timing-functions2.html [ Pass Timeout ]
+crbug.com/357085 [ Win Debug ] virtual/threaded/animations/unanimated-style.html [ Pass Timeout ]
+crbug.com/357088 [ Debug ] web-animations-api/timeline-updates-players.html [ Failure Pass ]
+crbug.com/357088 [ Linux Release ] web-animations-api/timeline-updates-players.html [ Failure Pass ]
 
 crbug.com/353087 w3c/web-platform-tests/shadow-dom/elements-and-dom-objects/shadowroot-object/shadowroot-attributes/test-005.html [ Failure ]
 crbug.com/353087 w3c/web-platform-tests/shadow-dom/elements-and-dom-objects/the-content-html-element/test-004.html [ Failure ]
@@ -966,6 +979,6 @@ crbug.com/355459 [ Release ] inspector/elements/edit-dom-actions-shadow.html [ P
 
 crbug.com/355463 [ Win Debug ] css3/flexbox/repaint.html [ Pass Failure ]
 crbug.com/356957 [ Win Debug ] editing/spelling/spellcheck-editable-on-focus.html [ Pass Timeout ]
-crbug.com/355489 media/activation-behavior.html [ Pass Failure ]
+crbug.com/355489 media/activation-behavior.html [ Pass Failure Timeout ]
 
 crbug.com/356148 media/audio-delete-while-slider-thumb-clicked.html [ Pass Crash ]