Plumb the DragOperation through all the layers between the platform Drag-n-drop code and WebCore.
This allows the HTML5 DataTransfer effectAllowed and dropEffect properties to be set correctly in JS handlers, as per the HTML5 spec.
(The drag-dropeffect test isn't in WebKit yet -- it's part of a separate WebKit patch that's been in review for weeks.)
R=darin,pink
BUG=http://code.google.com/p/chromium/issues/detail?id=14654, http://code.google.com/p/chromium/issues/detail?id=20985
TEST=LayoutTests/fast/events/drag-dropeffect.html, LayoutTests/editing/pasteboard/files-during-page-drags.html
Review URL: http://codereview.chromium.org/174364

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25629 0039d316-1c4b-4281-b951-d872f2087c98
41 files changed