Provide an API to set print document name.

Bug: 13250097

The current print api for Webview does not allow setting the
print document name, so all documents show up using a hardcoded
name (which is visible to the user). Deprecate the current API
and provide a new one that allows setting the document name.

Change-Id: I7043b78e98f25bbc0e0ef33e1d6d3b0d34401e48