How to save "scroll state" of PDF file in Chrome?

Chrome does not save the "scroll state" of a PDF file.

(Try opening a PDF file, closing the tab, and then re-opening it with CtrlShiftT. Or restart the browser after selecting "Settings" → "On startup" → "Continue where you left off".)

How can we enable this behavior?

Is there a flag to do so?

You could use this, it's the firefox pdf reader for Chrome/Chromium.

Chrome uses its own version of Acrobat Reader. A lot of functionality that is available in Acrobat's Reader, as well as viewers in other browsers, is severely lacking. Another example is the ability to rotate a PDF (Ctrl+shift++/-) do not work in chrome, yet work in IE and FF.

Chrome's development team has basically said that fixing this functionality is not a high priority for them. People have been complaining about these, and other PDF issues for several Chrome versions. I wouldnt hold my breath for a fix any time soon.