Add browser resource host for Apps v2 APIs in Pepper.

This CL doesn't include the logic of interacting with extension function dispatcher.

BUG=226303
TEST=None

Review URL: https://chromiumcodereview.appspot.com/15039008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@199143 0039d316-1c4b-4281-b951-d872f2087c98
9 files changed