Record metrics for how often users:
- Maximize a window in one direction by double clicking on the window border
- Snap a window left or right by dragging the window to the side of the screen

BUG=None
TEST=None

Review URL: https://codereview.chromium.org/130943005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246900 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246900