I'm guessing the issue is with

frame_->View()->ConvertFromRootFrame(adjusted_point)

That's likely going to do the wrong thing inside an OOPIF.

James, could you add this to your backlog?

I'm having difficulty reproducing this (I'm trying on Linux ToT). Even with different PSFs (zooming the content in and out via touch-emulation), I seem to be able to correctly place the cursor in any field, or even between letters of entered text.

I verified that I'm hitting the code path where the DCHECK is.

The only time it crashed was once when I was (emulated-)touch-scrolling the iframe ... but I couldn't get it to reproduce.

bokan@ - why do you think that line of code will fail in an oopif? All events going to the oopif will have been converted in the browser using a transform that should account for scale, etc. So the oopif will just think PSF = 1, so I'm not sure where the error would occur.

The one crash during touch scrolling isn't too surprising, as emulating a Pixel 2 would likely set a PSF < 1.f, and (at present) although events sent to OOPIFs have their coords converted, they *do not* have any deltas converted.

That function doesn't deal with PSF, just frame offsets in the page. If OOPIF targetting transforms the event coordinates such that it is relative to the local root then that should work.