[Cast, Android] Added isRemote() method to the WebMediaPlayer interface
[Cast, Android] Added isRemote() method to the WebMediaPlayer interface

Needed by https://codereview.chromium.org/644463003/

BUG=420665

Review URL: https://codereview.chromium.org/645503002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@183467 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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