Add canPlayType to Hls source handler

If someone calls player.canPlayType() with HLS registered as a source handler, it would fail at runtime. Related to videojs/video.js#2709.

@@ -95,13 +95,7 @@ videojs.Hls.canPlaySource = function() {
 videojs.HlsSourceHandler = function(mode) {
   return {
     canHandleSource: function(srcObj) {
-      var mpegurlRE = /^application\/(?:x-|vnd\.apple\.)mpegurl/i;
-
-      // favor native HLS support if it's available
-      if (videojs.Hls.supportsNativeHls) {
-        return false;
-      }
-      return mpegurlRE.test(srcObj.type);
+      return videojs.HlsSourceHandler.canPlayType(srcObj.type);
     },
     handleSource: function(source, tech) {
       if (mode === 'flash') {
@@ -117,10 +111,23 @@ videojs.HlsSourceHandler = function(mode) {
       });
       tech.hls.src(source.src);
       return tech.hls;
+    },
+    canPlayType: function(type) {
+      return videojs.HlsSourceHandler.canPlayType(type);
     }
   };
 };
 
+videojs.HlsSourceHandler.canPlayType = function(type) {
+  var mpegurlRE = /^application\/(?:x-|vnd\.apple\.)mpegurl/i;
+
+  // favor native HLS support if it's available
+  if (videojs.Hls.supportsNativeHls) {
+    return false;
+  }
+  return mpegurlRE.test(type);
+};
+
 // register source handlers with the appropriate techs
 if (videojs.MediaSource.supportsNativeMediaSources()) {
   videojs.getComponent('Html5').registerSourceHandler(videojs.HlsSourceHandler('html5'));

@@ -1917,6 +1917,8 @@ test('the source handler supports HLS mime types', function() {
     ok(videojs.HlsSourceHandler(techName).canHandleSource({
       type: 'aPplicatiOn/VnD.aPPle.MpEgUrL'
     }), 'supports vnd.apple.mpegurl');
+    ok(videojs.HlsSourceHandler(techName).canPlayType('aPplicatiOn/VnD.aPPle.MpEgUrL'), 'supports vnd.apple.mpegurl');
+    ok(videojs.HlsSourceHandler(techName).canPlayType('aPplicatiOn/x-MPegUrl'), 'supports x-mpegurl');
 
     ok(!(videojs.HlsSourceHandler(techName).canHandleSource({
       type: 'video/mp4'
@@ -1924,6 +1926,8 @@ test('the source handler supports HLS mime types', function() {
     ok(!(videojs.HlsSourceHandler(techName).canHandleSource({
       type: 'video/x-flv'
     }) instanceof videojs.HlsHandler), 'does not support flv');
+    ok(!(videojs.HlsSourceHandler(techName).canPlayType('video/mp4')), 'does not support mp4');
+    ok(!(videojs.HlsSourceHandler(techName).canPlayType('video/x-flv')), 'does not support flv');
   });
 });