UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36

Steps to reproduce the problem:
1. Open an email with attachment in chrome
2. Drag the attachment from the email to desktop
3. Downloaded file does not appear in chrome://downloads/ and chrome.downloads.* APIs are not triggered

What is the expected behavior?
The file will be downloaded as any other file and events will be triggered accordingly

What went wrong?
Download managers and other extensions that are registered to such events are not aware that a file was downloaded

WebStore page: 

Did this work before? N/A 

Chrome version: 51.0.2704.106  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 22.0 r0