polyfill liferay-upload with DataTransfer so that IE8, IE9 can drop files

• Type: Technical Task
• Status: Closed
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 6.2.0 CE M4
• Fix Version/s: 6.2.0 CE M4
• Component/s: Documents & Media, ~ [Archived] Frontend Infrastructure
• Labels: None
• Epic/Theme:
  • Platform

In order to port over support for transfering files from the desktop to document library (now that LPS-29544 is pushed into master) we need a couple things to happen.

1. shim IE <= 8 with File, FileReader, FileList, and DataTransfer – which we are calling MsDataTransfer. (check)
2. shim ... with xhr2 (road-blocked)