GitLab

Add methods to NativePanel. Also provide dummy implementation for all platforms.

BUG=none
TEST=no test due to no new functionity

Review URL: http://codereview.chromium.org/8681025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112532 0039d316-1c4b-4281-b951-d872f2087c98