New files, classes moved from statscollector_unittest.cc: +webrtc/api/test/mock_peerconnection.h for MockPeerConnectionFactory and MockPeerConnection +webrtc/api/test/mock_webrtcsession.h for MockWebRtcSession +webrtc/media/base/test/mock_mediachannel.h for MockVideoMediaChannel and MockVoiceMediaChannel The webrtc/media/base/test folder is new. BUG=chromium:627816 Review-Url: https://codereview.webrtc.org/2238933002 Cr-Commit-Position: refs/heads/master@{#13769}