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Migrate the legacy IPC message DragMsg_TargetDrop to the TargetDrop Mojo
message in blink.mojom.FrameWidget.

To support this operation, this CL adds blink.mojom.DragData, a Mojo
type representing the same data as blink::WebDragData, and a typemap.
This typemap is a temporary measure to work around the fact that several
methods using WebDragData cross the content/Blink boundary and cannot
use the Mojo type directly. In the future, WebDragData may be completely
replaced by its Mojo version.

Bug: 1039255
Change-Id: Ide4dd659ac967cf976db04b86eff111b5b9ef336
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2232326
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787558}