Add CF_HDROP path for dragging on Win Aura

Add CF_HDROP path for dragging on Win Aura

This ports the PrepareDragForDownload path over from the native windows
code path. This makes dragging files to explorer from, for example, gmail
save the content of the file, rather than a link, or the thumbnail
image.

(This needs to be merged to 32, so attempted to keep it semi-localized.)

BUG=332579, 333320
R=ben@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=244355

[Ben Goodger (Google), 2014-01-11 05:01:46]

lgtm

https://codereview.chromium.org/135393002/diff/60001/content/browser/web_cont...
File content/browser/web_contents/web_contents_view_aura.cc (right):

https://codereview.chromium.org/135393002/diff/60001/content/browser/web_cont...
content/browser/web_contents/web_contents_view_aura.cc:299: base::FilePath
download_path =
nit: nl above

[scottmg, 2014-01-11 05:02:46]

https://codereview.chromium.org/135393002/diff/60001/content/browser/web_cont...
File content/browser/web_contents/web_contents_view_aura.cc (right):

https://codereview.chromium.org/135393002/diff/60001/content/browser/web_cont...
content/browser/web_contents/web_contents_view_aura.cc:299: base::FilePath
download_path =
On 2014/01/11 05:01:47, Ben Goodger (Google) wrote:
> nit: nl above

Done.

[scottmg, 2014-01-11 17:52:20]

Committed patchset #4 manually as r244355.