Bug 1071015 - added videoWidth, videoHeight and fps (mozPaintedFrames) to logcat

When there is only one video tag element inside DOM, it means that on device' screen we are seen just our local video. When  another video tag is added, it means that loop is receiving its peer's video, so videoTags.length > 1. When this condition holds we can access peer's video resolution and mozPaintedFrames.