Setup skeleton code for browser GCM internals page. This page will display GCM status which helps developer debug their GCM applications.

Code reviewer: jianli and fgorski
Owner reviewer: arv, sky

BUG=341256

Review URL: https://codereview.chromium.org/156423002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250603 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250603