cefclient renders blank OOPIF with --off-screen-rendering-enabled

What steps will reproduce the problem?

run cefclient with ./cefclient --site-per-process --url="http://csreis.github.io/tests/cross-site-iframe.html" --off-screen-rendering-enabled
click on "Go cross-site (complex page)" button
only white iframe is rendered

What is the expected output? What do you see instead?

Expected: the contents of http://build.chromium.org should be seen

Observed: just blank page (see attached screenshot). "Go cross-site (simple page)" and "Go same-site" works fine.

I could see that there's extra renderer process for this iframe and from logs at least it tries to load the resources, it's just somehow the final rendering is missing.

I'm not sure if the problem is related to Issue #2577 or not though.

What version of the product are you using? On what operating system?

I'm using the latest 3578 cef branch. I tried to build it from the sources, and to use the distributed binary "cef_binary_3.3578.1864.gfa073f3_linux64.tar.bz2", unfortunately neither did work as expected.

Tested on a Ubuntu 16.04.5 LTS 64 bit machine.

Does the problem reproduce with the cefclient or cefsimple sample application at the same version? How about with a newer or older version?

Untested

Does the problem reproduce with Google Chrome at the same version? How about with a newer or older version?

Chrome works fine, as it probably doesn't have osr flag.

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