Mark some tests flaky

LayoutTests/TestExpectations

Index: LayoutTests/TestExpectations
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
index 59bf128b3cb5331056cff1e07c908fe229497a03..4b8fa2fa0c4bfab01016b90243f5749f2ce2eb2c 100644
--- a/LayoutTests/TestExpectations
+++ b/LayoutTests/TestExpectations
@@ -952,6 +952,13 @@ crbug.com/353208 fast/files/workers/worker-read-blob-async-crash.html [ Pass Cra
 crbug.com/353301 [ Win ] svg/custom/js-late-gradient-and-object-creation.svg [ Pass ImageOnlyFailure ]
 
 crbug.com/351658 fast/events/window-onerror-03.html [ NeedsManualRebaseline ]
+crbug.com/356991 [ Linux Debug ] fast/canvas/canvas-createImageBitmap-drawImage-video.html [ Crash Pass ]
+crbug.com/356992 [ Debug ] fast/dom/Window/timer-null-script-execution-context.html [ Crash Pass ]
+crbug.com/356994 [ Debug ] fast/dom/shadow/access-document-of-detached-stylesheetlist-crash.html [ Crash Pass ]
+crbug.com/356995 [ Debug ] fast/mediastream/MediaStreamConstructor.html [ Crash Pass ]
+crbug.com/356996 [ Debug ] html5lib/generated/run-tests1-data.html [ Pass Timeout ]
+crbug.com/356996 [ Mac Release ] html5lib/generated/run-tests1-data.html [ Pass Timeout ]
+crbug.com/356997 http/tests/security/isolatedWorld/events.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 ]