Mark css3/blending/svg-blend-multiply.html as failing for SPV2

This expectation recently changed:
https://crrev.com/601414 - rebaseline SK_LEGACY_COMPLEX_XFERMODES

There is a single-digit difference in color but this is a ref test and
cannot be rebaselined so a failing expectation has been added.

Change-Id: I81ae8dabfd97c6571b468dd2256a003211421fcd
Reviewed-on: https://chromium-review.googlesource.com/c/1297071
Commit-Queue: Philip Rogers <pdr@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602050}

third_party/WebKit/LayoutTests/FlagExpectations/enable-slimming-paint-v2

@@ -960,6 +960,7 @@ crbug.com/589265 images/color-profile-layer-filter.html [ Failure Crash ]
 crbug.com/589265 svg/text/text-layout-crash.html [ Failure ]
 crbug.com/589265 virtual/threaded/animations/svg/animated-filter-svg-element.html [ Failure Crash ]
 crbug.com/589265 compositing/perspective-interest-rect.html [ Failure ]
+Bug(none) css3/blending/svg-blend-multiply.html [ Failure ]
 
 # Some work remains to fully support composited animation and scrolling.
 crbug.com/702350 virtual/threaded/transitions/opacity-transform-transitions-inside-iframe.html [ Timeout ]