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The current drag'n'drop implementation only supports transfer of text.

This CL adds support for additional types such as files, URLs, and HTML.

R=msisov@igalia.com

Bug: 1004715
Change-Id: Ic7430c0bf7820c55b8ac99b01a3f684c2d7c8a51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815863
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Maksim Sisov <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#701932}