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This CL adds an app-style widget called app-drawer to the Silk page set. The
app-drawer widget comes from https://github.com/abarth/app-widgets and is based
on Android's navigation drawer:

http://developer.android.com/design/patterns/navigation-drawer.html

R=nduca@chromium.org
TBR=boliu@chromium.org
BUG=332439

Review URL: https://codereview.chromium.org/120753003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243722 0039d316-1c4b-4281-b951-d872f2087c98