Flatten compositing layer when painting drag images
Flatten compositing layer when painting drag images

In compositing mode, everything is a compositing layer since the NCCH removal.
Nothing will be painted without the flag.

BUG=246651
R=jamesr@chromium.org
TEST=manual

Review URL: https://chromiumcodereview.appspot.com/16500004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@152329 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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