Partially implement the new pepper API in Chrome. This is not actually hooked

up, which will require some changes in render_view as well as the plugin list.

TEST=none
BUG=none
Review URL: http://codereview.chromium.org/1697008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@46760 0039d316-1c4b-4281-b951-d872f2087c98