Disable these tests only on debug build. They're expected to fail on debug build.

third_party/WebKit/LayoutTests/TestExpectations

 # ====== Oilpan-only failures from here ======
 # Most of these actually cause the tests to report success, rather than
 # failure. Expected outputs will be adjusted for the better once Oilpan
 # has been well and truly enabled always.
 
 crbug.com/420008 inspector/tracing/worker-js-frames.html [ Pass Timeout Failure ]
 crbug.com/420008 virtual/threaded/inspector/tracing/worker-js-frames.html [ Pass Timeout Failure ]
 crbug.com/596940 inspector-protocol/runtime/runtime-execution-contexts-events.html [ Pass Timeout ]
 crbug.com/597572 [ Debug ] http/tests/inspector/resource-tree/resource-tree-reload.html [ Pass Failure ]
 
@@ skipping 203 matching lines @@
 crbug.com/248938 [ Win Debug ] virtual/threaded/transitions/transition-end-event-multiple-04.html [ Pass Failure ]
 crbug.com/352405 virtual/threaded/animations/transition-and-animation-1.html [ Pass Timeout ]
 
 crbug.com/542541 [ Debug ] fast/events/click-count.html [ Pass Failure ]
 crbug.com/542541 [ Debug ] virtual/trustedeventsdefaultaction/fast/events/click-count.html [ Pass Failure ]
 crbug.com/542541 [ Debug ] virtual/pointerevent/fast/events/click-count.html [ Pass Failure ]
 
 # TODO(oshima): Mac Android are currently not supported.
 crbug.com/567837 [ Mac Android ] virtual/scalefactor200withzoom/fast/hidpi/static [ Skip ]
 
-# TODO(oshima): Debug build generates slightly different image for these tests.
+# TODO(oshima): Debug build generates slightly different image for these tests due to different background color.
 #crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/calendar-picker-appearance.html [ Skip ]
 crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/data-suggestion-picker-appearance.html [ Skip ]
 crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/popup-menu-appearance.html [ Skip ]
+crbug.com/593567 [ Debug ] virtual/scalefactor150/fast/hidpi/static/calendar-picker-appearance.html [ Skip ]
+crbug.com/593567 [ Debug ] virtual/scalefactor200/fast/hidpi/static/calendar-picker-appearance.html [ Skip ]
+crbug.com/593567 [ Debug ] virtual/scalefactor200withzoom/fast/hidpi/static/calendar-picker-appearance.html [ Skip ]
 
 # Mac does not support fractional scale factor.
 crbug.com/567837 [ Mac ] virtual/scalefactor150/fast/hidpi/static [ Skip ]
 
 # TODO(oshima): Move the event scaling code to eventSender and remove this.
 crbug.com/567837 virtual/scalefactor200/fast/hidpi/static/mousewheel-scroll-amount.html [ Skip ]
 crbug.com/567837 virtual/scalefactor200/fast/hidpi/static/gesture-scroll-amount.html [ Skip ]
 crbug.com/567837 virtual/scalefactor150/fast/hidpi/static/mousewheel-scroll-amount.html [ Skip ]
 crbug.com/567837 virtual/scalefactor150/fast/hidpi/static/gesture-scroll-amount.html [ Skip ]
 
@@ skipping 1061 matching lines @@
 crbug.com/601669 [ Win ] svg/as-image/svg-nested.html [ Crash ]
 
 crbug.com/603507 [ Mac Win ] fast/table/split-table-section-before-anonymous-block-2.html [ NeedsManualRebaseline ]
 crbug.com/603507 [ Mac Win ] fast/table/split-table-section-before-anonymous-block-4.html [ NeedsManualRebaseline ]
 
 crbug.com/178369 fast/table/max-width-integer-overflow.html [ NeedsManualRebaseline ]
 
 crbug.com/600261 imported/wpt/mediacapture-streams/GUM-deny.html [ Failure ]
 crbug.com/600261 imported/wpt/mediacapture-streams/MediaStream-MediaElement-srcObject.html [ Failure ]
 
-crbug.com/593679 virtual/scalefactor150/fast/hidpi/static/calendar-picker-appearance.html [ NeedsManualRebaseline ]
-crbug.com/593679 virtual/scalefactor200/fast/hidpi/static/calendar-picker-appearance.html [ NeedsManualRebaseline ]
-crbug.com/593679 virtual/scalefactor200withzoom/fast/hidpi/static/calendar-picker-appearance.html [ NeedsManualRebaseline ]
-
 crbug.com/605525 [ Win ] http/tests/xmlhttprequest/redirect-cross-origin-post.html [ Failure Pass ]
 
 crbug.com/603703 [ Linux Mac ] imported/wpt/web-animations/animation-timeline/document-timeline.html [ Failure Pass ]
 
 crbug.com/600248 imported/wpt/web-animations/animation-effect-timing/endDelay.html [ Failure ]
 crbug.com/600248 imported/wpt/web-animations/animation/constructor.html [ Failure Timeout ]
 crbug.com/600248 imported/wpt/web-animations/animation/finished.html [ Pass Failure ]
 crbug.com/600248 imported/wpt/web-animations/animation/oncancel.html [ Pass Failure ]
 crbug.com/600248 imported/wpt/web-animations/animation/onfinish.html [ Pass Failure ]
 
@@ skipping 87 matching lines @@
 crbug.com/487344 media/media-document-audio-repaint.html [ NeedsManualRebaseline ]
 crbug.com/487344 media/video-controls-rendering.html [ NeedsManualRebaseline ]
 crbug.com/487344 media/video-controls-with-cast-rendering.html [ NeedsManualRebaseline ]
 crbug.com/487344 media/video-display-toggle.html [ NeedsManualRebaseline ]
 crbug.com/487344 media/video-empty-source.html [ NeedsManualRebaseline ]
 crbug.com/487344 media/video-no-audio.html [ NeedsManualRebaseline ]
 crbug.com/487344 media/video-paint-invalidation.html [ NeedsManualRebaseline ]
 
 crbug.com/606302 [ Win7 Debug ] transforms/3d/point-mapping/3d-point-mapping-deep.html [ Failure ]
 crbug.com/606302 [ Win7 Mac10.11 Debug Linux Debug ] transforms/3d/point-mapping/3d-point-mapping-preserve-3d.html [ Failure ]