[ Merge of http://go/wvgerrit/94323 ]
Content providers wish to know the application package name that is
requesting a license from the content server. The app package name that
is provided to the CDM during initialization is provided to the client
identification message as a key-value pair during license request
generation. App packages names are keyed under 'application_name'.
This feature was tested manually by scraping the content of the license
request for YouTube TV.
Bug: 148689078
Test: manual
Change-Id: I6b65f2ab9845dbea37aaaab76ecea25c228bde5b