These tests are failing when RootLayerScrolling is turned on:

RenderViewImplTest.PreferredSizeZoomed
RenderViewImplScaleFactorTest.PreferredSizeWithScaleFactor

The affected suites are:

content_browsertests
network_service_content_browsertests
site_per_process_content_browsertests
viz_content_browsertests

Failing on these bots:

linux_chromium_rel_ng
cast_shell_linux
mac_chromium_rel_ng
linux_chromium_tsan_rel_ng
linux_chromium_asan_rel_ng

Output:

[ RUN      ] RenderViewImplTest.PreferredSizeZoomed
Fontconfig warning: "/etc/fonts/fonts.conf", line 146: blank doesn't take any effect anymore. please remove it from your fonts.conf
../../content/renderer/render_view_browsertest.cc:2178: Failure
Expected equality of these values:
  gfx::Size(400, 400)
    Which is: 400x400
  size
    Which is: 415x400
[  FAILED  ] RenderViewImplTest.PreferredSizeZoomed (133 ms)
[ RUN      ] RenderViewImplTest.PreferredSizeZoomed

[ RUN      ] RenderViewImplScaleFactorTest.PreferredSizeWithScaleFactor
Fontconfig warning: "/etc/fonts/fonts.conf", line 146: blank doesn't take any effect anymore. please remove it from your fonts.conf
../../content/renderer/render_view_browsertest.cc:2194: Failure
Expected equality of these values:
  gfx::Size(400, 400)
    Which is: 400x400
  size
    Which is: 415x400
../../content/renderer/render_view_browsertest.cc:2201: Failure
Expected equality of these values:
  gfx::Size(400, 400)
    Which is: 400x400
  size
    Which is: 415x400
[  FAILED  ] RenderViewImplScaleFactorTest.PreferredSizeWithScaleFactor (109 ms)