Suppress two layout test failures on 'WebKit Android (Nexus4)'.

  external/wpt/web-animations/interfaces/Animatable/animate.html
  http/tests/worklet/webexposed/
    global-interface-listing-paint-worklet.html

These are the remaining test failures seen on this bot when running
with --use-gpu-in-tests. Unfortunately there doesn't seem to be a way
to specialize these for this device.

Bug: 875172
Change-Id: I050b131b2702987f2e5803ac6e75ea6dfae35b2b
Reviewed-on: https://chromium-review.googlesource.com/1183979Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584915}

third_party/WebKit/LayoutTests/TestExpectations

@@ -5015,3 +5015,7 @@ crbug.com/862589 [ Linux Mac Win ] virtual/threaded/fast/idle-callback/long_idle
 
 # Sheriff 2018-08-21
 crbug.com/873829 [ Mac ] virtual/mouseevent_fractional/fast/events/autoscroll-iframe-no-scrolling.html [ Timeout Pass ]
+
+# Failures on 32-bit Android when using GPU instead of software rendering
+crbug.com/875172 [ Android ] external/wpt/web-animations/interfaces/Animatable/animate.html [ Pass Failure ]
+crbug.com/875172 [ Android ] http/tests/worklet/webexposed/global-interface-listing-paint-worklet.html [ Pass Failure ]