Allow a video to be correctly resumed programatically after being paused.

        public static void play(String url, int time, HTML5VideoViewProxy proxy,

                WebChromeClient client) {

            if (mCurrentProxy == proxy) {

                if (!mVideoView.isPlaying()) {

                    mVideoView.start();

                }

                return;

            }

            if (mCurrentProxy != null) {

                // Some other video is already playing. Notify the caller that its playback ended.

                proxy.playbackEnded();

                return;

            }

            mCurrentProxy = proxy;

            // Create a FrameLayout that will contain the VideoView and the

            // progress view (if any).