Attempt to deflake svg/custom/js-late-{clipPath,gradient}-and-...svg

LayoutTests/TestExpectations

 # turn off Slimming Paint tests for all non-Linux platforms...
 crbug.com/453972 [ Mac ] virtual/slimmingpaint/ [ Skip ]
 crbug.com/453972 [ Win ] virtual/slimmingpaint/ [ Skip ]
 crbug.com/453972 [ Android ] virtual/slimmingpaint/ [ Skip ]
 # except for fast/block/, as a sanity test directory.
 crbug.com/453972 [ Mac ] virtual/slimmingpaint/fast/block [ Pass ]
 crbug.com/453972 [ Win ] virtual/slimmingpaint/fast/block [ Pass ]
 crbug.com/453972 [ Android ] virtual/slimmingpaint/fast/block [ Pass ]
 
 crbug.com/474117 compositing/overflow/overflow-positioning.html [ ImageOnlyFailure Pass ]
@@ skipping 753 matching lines @@
 crbug.com/242735 fast/css/ex-unit-with-no-x-height.html [ ImageOnlyFailure Failure ]
 crbug.com/242735 virtual/slimmingpaint/fast/css/ex-unit-with-no-x-height.html [ Failure ]
 
 crbug.com/327698 [ Win Release ] virtual/gpu/fast/canvas/canvas-lost-gpu-context.html [ Pass Timeout ]
 crbug.com/327698 [ Debug Linux Mac Win ] virtual/gpu/fast/canvas/canvas-lost-gpu-context.html [ Pass Timeout ]
 
 # Flaky on several platforms.
 crbug.com/320139 fast/repaint/block-layout-inline-children-replaced.html [ Failure Pass ]
 crbug.com/320139 virtual/slimmingpaint/fast/repaint/block-layout-inline-children-replaced.html [ Failure Pass ]
 
+crbug.com/302529 svg/custom/js-late-clipPath-and-object-creation.svg [ NeedsRebaseline ]
+crbug.com/353301 svg/custom/js-late-gradient-and-object-creation.svg [ NeedsRebaseline ]
+
 # This test is flaky on all platforms, and has image failures most of the time on
 # WebKit Win7 (dbg)
-crbug.com/302529 svg/custom/js-late-clipPath-and-object-creation.svg [ Failure Pass ]
+# Re-evaluate/re-enable after rebaselining.
+#crbug.com/302529 svg/custom/js-late-clipPath-and-object-creation.svg [ Failure Pass ]
+#crbug.com/353301 svg/custom/js-late-gradient-and-object-creation.svg [ Pass Failure ]
 
 crbug.com/255714 [ Linux ] editing/execCommand/switch-list-type-with-orphaned-li.html [ Failure Pass ]
 crbug.com/231910 fast/dom/vertical-scrollbar-in-rtl.html [ Failure Pass ]
 crbug.com/231910 virtual/slimmingpaint/fast/dom/vertical-scrollbar-in-rtl.html [ Failure Pass ]
 
 crbug.com/310323 http/tests/pointer-lock/iframe-sandboxed-allow-pointer-lock.html [ Crash Pass ]
 crbug.com/469190 [ XP Release ] fast/transforms/transformed-document-element.html [ Pass ImageOnlyFailure ]
 crbug.com/469190 [ XP Release ] virtual/slimmingpaint/fast/transforms/transformed-document-element.html [ Pass ImageOnlyFailure ]
 crbug.com/469190 [ XP Release ] svg/transforms/text-with-pattern-inside-transformed-html.xhtml [ Pass ImageOnlyFailure Failure ]
 crbug.com/469190 [ XP ] svg/W3C-SVG-1.1/struct-frag-02-t.svg [ ImageOnlyFailure ]
@@ skipping 273 matching lines @@
 crbug.com/453944 [ Mac ] fast/images/png-suite/test.html [ Crash Pass ]
 crbug.com/453944 [ Mac ] virtual/deferred/fast/images/png-suite/test.html [ Crash Pass ]
 crbug.com/453944 [ Mac ] virtual/slimmingpaint/fast/images/png-suite/test.html [ Crash Pass ]
 
 crbug.com/419696 [ Mac Debug ] fast/text/font-linux-normalize.html [ Crash Pass ]
 crbug.com/419696 [ Mac Debug ] virtual/slimmingpaint/fast/text/font-linux-normalize.html [ Crash Pass ]
 crbug.com/419696 [ Mac Debug ] virtual/antialiasedtext/fast/text/font-linux-normalize.html [ Crash Pass ]
 
 crbug.com/353186 [ Win Debug ] http/tests/security/webgl-remote-read-remote-image-allowed-with-credentials.html [ Pass Timeout ]
 crbug.com/353208 fast/files/workers/worker-read-blob-async-crash.html [ Pass Crash Timeout ]
-crbug.com/353301 svg/custom/js-late-gradient-and-object-creation.svg [ Pass Failure ]
 
 crbug.com/356991 [ Linux Debug ] fast/canvas/canvas-createImageBitmap-drawImage-video.html [ Crash Pass ]
 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/357068 css3/images/cross-fade-invalidation.html [ ImageOnlyFailure Pass ]
 crbug.com/392626 [ XP ] 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/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 ]
@@ skipping 1006 matching lines @@
 crbug.com/476913 [ Debug SnowLeopard ] fast/text/unicode-fallback-font.html [ Crash ]
 
 crbug.com/477252 [ Win ] http/tests/fetch/window/stream-reader.html [ Pass Timeout ]
 
 crbug.com/479164 inspector/geolocation-emulation-tests.html [ Pass Failure ]
 
 crbug.com/479181 inspector-protocol/animation/animation-multiple-frames.html [ Pass Failure ]
 
 crbug.com/479202 fast/forms/select/select-typeahead-with-spacekey.html [ Pass Failure ]
 crbug.com/479202 virtual/slimmingpaint/fast/forms/select/select-typeahead-with-spacekey.html [ Pass Failure ]