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Allows the host side to register a ResourceHost as pending and send an ID to the plugin, to be connected to a PluginResource at a future time.

BUG=


Review URL: https://chromiumcodereview.appspot.com/11414147

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171099 0039d316-1c4b-4281-b951-d872f2087c98