[M120 Migration][MM] Support webmedia playback state notification

[M120 Migration][MM] Support webmedia playback state notification

1. webbrowser need playbackstart event to show miniplayer button,
   this patch implement ewk interface to notify player state to APP,
   at the same time it get translated url and drm information from APP;
2. Impement a switch kEnableMediaPlaybackNotification, set from
   ewk_settings_media_playback_notification_set;
3. Impement GetContentMIMEType from html media element and set it to esplayer;

Patch from:
https://review.tizen.org/gerrit/#/c/292410/

Change-Id: I88c787896baa4176769c3eb64214d94bee72ffaa
Signed-off-by: xiaofang <fang.xiao@samsung.com>
Signed-off-by: zhishun.zhou <zhishun.zhou@samsung.com>