[GStreamer] HTTP source element lacks SCHEDULING query support
https://bugs.webkit.org/show_bug.cgi?id=139064

Reviewed by Carlos Garcia Campos.

No new tests, covered by http/tests/media/hls.

* platform/graphics/gstreamer/WebKitWebSourceGStreamer.cpp:
(webKitWebSrcQueryWithParent): Make the element handle SCHEDULING
queries with the BANDWIDTH_LIMITED flag. This helps uridecodebin
to configure itself for adaptive streaming playback scenarios.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@176561 268f45cc-cd09-0410-ab3c-d52691b4dbfc