I noticed this when a content_browsertest I wrote on https://chromium-review.googlesource.com/966988 failed on Android.  Debugging further, I found that there seems to be a generic problem with window.open() not showing the contents of the new window in Android content shell.

Repro steps:
1) Build/install/launch Android content shell:
ninja -C out/release content_shell_apk -j 2000
out/release/bin/content_shell_apk install
out/release/bin/content_shell_apk launch

2) Navigate to http://csreis.github.io/tests/window-open.html

3) Press the first "Open simple window" button, which window.opens a same-site page.

Expected: the new window shows "Simple page"

Actual: the new window shows up blank.

I noticed that pressing on the address bar will will make the contents of the new window show up.  Similarly, rotating the device will also make it show up.

Adding boliu@ and a few people from content/browser/android/OWNERS, hoping that someone knows how to triage this.