app: Add unittests for TreeNodeModel.

BUG=None
TEST=out/Debug/app_unittests --gtest_filter=TreeNodeModelTest.*

Signed-off-by: Thiago Farina <[email protected]>

Review URL: http://codereview.chromium.org/3017023

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55179 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed