Enable general CSS filters in the software compositor

The software compositor has only supported filters that include a
reference filter. This CL enables support for filters that don't
include a reference filter.

BUG=160302

Review URL: https://codereview.chromium.org/24090003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229569 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229569
Cleanup: Use PostTaskAndReplyWithResults in ImageCaptureDevice.

Review URL: https://codereview.chromium.org/27692004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229570 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229570