Enable dragging of images to desktop (Finder), Preview, etc. (on Mac).

This hooks up drag-and-drop of file promises, lazy writing to the drag
pasteboard, drag-sourcing of TIFF images (via Cocoa) and file contents.

Patch Set 5 improvements: Adds asynchronous writing of promised files.

Patch Set 4 improvements: Big refactoring -- drag source stuff is now
handled by the WebDragSource (Cocoa) object, with messages proxied
through the TabContentsViewCocoa object. The WebDragSource object
carries a weak reference to the TCVC, owns the WebDropData, and keeps
track of the drag pasteboard types/promises.

Patch Set 3 improvements over Patch Set 2: It shouldn't crash anymore. Made
drop_data_ reference counted, in anticipation of asynchronous file
writing.

TODO #1: Testing. Still need a unit test, maybe. Should make sure that
dragging by file contents actually works.

TODO #2 (in some other patch): Refactor some of the WebDropData
extraction code out, e.g., file name extraction should be made common
with other platforms.

TODO #3 (in some other patch): We really should make WebDropData cheaper
to copy around and retain. I'm not convinced it's a good idea to push
out the entire thing over IPC, especially since the data pushed could be
very big and may not even be used.

BUG=15640
TEST=drag images to various applications

Patch by viettrungluu@gmail.com


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@22187 0039d316-1c4b-4281-b951-d872f2087c98

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