Revert 105759 - Revert 105755 - Fails on XP and Vista

Fixed win tests.

Adding experimental extension clipboard api.

The api will give extensions that use it access to system clipboard.

design doc:
https://docs.google.com/a/google.com/document/d/1my6Ifb86y0M9WMNNUqkE1LSXe8WLwfRtY3ZUetqNKt0/edit?hl=en_US

TEST=ExtensionClipboardApiTest.*
BUG=chromium-os:20492

Review URL: http://codereview.chromium.org/8258007

[email protected]
Review URL: http://codereview.chromium.org/8306020

[email protected]
Review URL: http://codereview.chromium.org/8294014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@105855 0039d316-1c4b-4281-b951-d872f2087c98
16 files changed