Allow proper highlighting on universal overflow scroll.

LayoutTests/TestExpectations

 # This directly has manual tests that don't have to run with run-webkit-tests
 crbug.com/359838 http/tests/ManualTests/ [ Skip ]
 
 crbug.com/258949 fast/filesystem/workers/file-writer-truncate-extend.html [ Failure Pass ]
 
 crbug.com/307782 [ Win ] http/tests/cache/stopped-revalidation.html [ Pass Timeout ]
 crbug.com/316146 [ XP ] http/tests/cache/cached-main-resource.html [ Pass Timeout ]
 
 # Transient - XHR mixed content type revert will be restored.
 crbug.com/305303 http/tests/security/mixedContent/insecure-sync-post-xhr-allowed.html [ Failure Pass ]
@@ skipping 163 matching lines @@
 crbug.com/318978 [ Linux ] http/tests/security/contentSecurityPolicy/1.1/plugintypes-url-01.html [ Skip ]
 crbug.com/318978 [ Linux ] http/tests/security/contentSecurityPolicy/1.1/plugintypes-url-02.html [ Skip ]
 crbug.com/318978 [ Linux ] http/tests/security/contentSecurityPolicy/object-in-svg-foreignobject.html [ Skip ]
 crbug.com/318978 [ Linux ] http/tests/security/contentSecurityPolicy/object-src-none-allowed.html [ Skip ]
 crbug.com/318978 [ Linux ] http/tests/security/contentSecurityPolicy/object-src-url-blocked.html [ Skip ]
 crbug.com/318978 [ Linux ] http/tests/security/frameNavigation/xss-DENIED-plugin-navigation.html [ Skip ]
 crbug.com/318978 [ Linux ] permissionclient/plugin-permission.html [ Skip ]
 crbug.com/318978 [ Linux ] plugins/ [ Skip ]
 crbug.com/318978 [ Linux ] virtual/softwarecompositing/plugins/invalidate_rect.html [ Skip ]
 
+Bug(hartmanng) compositing/overflow/selection-gaps.html [ NeedsRebaseline ]
+Bug(hartmanng) virtual/softwarecompositing/overflow/selection-gaps.html [ NeedsRebaseline ]
+Bug(hartmanng) virtual/gpu/compositedscrolling/overflow/selection-gaps.html [ NeedsRebaseline ]

[Ian Vollick, 2014/05/31 01:17:36]

I wonder if we could make this a ref test, and in the -expected.html, we could
make the background opaque white rather than turning off accelerated overflow
scrolling. That way we should have the same stuff being composited and we
shouldn't (hopefully) run into the same AA-related pixel diffs.

[hartmanng, 2014/06/02 20:23:58]

I like it. Done.

+
 # Hits an assert on Snow-leopard Debug but not on any other platforms.
 crbug.com/347186 [ Snowleopard Debug ] inspector/sources/debugger/async-callstack-mutation-observer.html [ Skip ]
 crbug.com/347186 [ Snowleopard Debug ] inspector/sources/debugger/async-callstack.html [ Skip ]
 crbug.com/347186 [ Snowleopard Debug ] inspector/sources/debugger/async-callstack-scopes.html [ Skip ]
 crbug.com/347186 [ Snowleopard Debug ] inspector/console/console-format.html [ Skip ]
 crbug.com/347186 [ Snowleopard Debug ] inspector/elements/styles/pseudo-elements.html [ Skip ]
 crbug.com/347186 [ Snowleopard Debug ] inspector/sources/debugger/dom-breakpoints.html [ Skip ]
 
 # Flaky:
 crbug.com/374270 http/tests/security/frameNavigation/context-for-location.html [ Failure Pass ]
@@ skipping 5633 matching lines @@
 Bug(eae) [ XP ] virtual/threaded/compositing/visibility/visibility-image-layers.html [ NeedsManualRebaseline ]
 Bug(eae) [ Win ] virtual/threaded/transitions/move-after-transition.html [ NeedsManualRebaseline ]
 Bug(eae) [ XP ] virtual/threaded/transitions/svg-text-shadow-transition.html [ NeedsManualRebaseline ]
 
 # Following test case needs to be rebased after https://codereview.chromium.org/276573010.
 crbug.com/372502 fast/text/shaping/same-script-different-lang.html [ NeedsRebaseline ]
 crbug.com/372502 virtual/windows-directwrite/fast/text/shaping/same-script-different-lang.html [ NeedsRebaseline ]
 crbug.com/372502 compositing/rtl/rtl-iframe-fixed-overflow.html [ NeedsRebaseline ]
 crbug.com/372502 virtual/mac-antialiasedtext/fast/text/shaping/same-script-different-lang.html [ NeedsRebaseline ]