video.js: Local patch for subtitle loading behavior

Upstream PR in progress, will add more adjustments to it
and later will be able to remove this patch here.
videojs/video.js#6043

Bug: T222763
Change-Id: I4d2eeb44dacdcd12c7717d208b21bed2775a8360

Gruntfile.js

@@ -122,6 +122,14 @@ module.exports = function ( grunt ) {
 				files: {
 					'resources/videojs-resolution-switcher/videojs-resolution-switcher.css': 'resources/videojs-resolution-switcher/videojs-resolution-switcher.css'
 				}
+			},
+			'videojs-text-tracks-on-demand': {
+				options: {
+					patch: 'patches/videojs-text-tracks-on-demand.patch'
+				},
+				files: {
+					'resources/videojs/video.js': 'resources/videojs/video.js'
+				}
 			}
 		}
 	} );
@@ -133,7 +141,8 @@ module.exports = function ( grunt ) {
 		'copy:videojs-ogvjs',
 		'patch:videojs-resolution-switcher',
 		'patch:videojs-resolution-switcher-icon',
-		'patch:videojs-ogvjs'
+		'patch:videojs-ogvjs',
+		'patch:videojs-text-tracks-on-demand'
 	] );
 	grunt.registerTask( 'update-ogvjs', [ 'exec:npm-update-videojs', 'copy:ogv.js' ] );
 	grunt.registerTask( 'test', [ 'eslint', 'stylelint', 'banana' ] );

patches/videojs-text-tracks-on-demand.patch

@@ -0,0 +1,25 @@
+diff -ur node_modules/video.js/dist/video.js old-video.js-patched/dist/video.js
+--- dist/video.js	1985-10-26 01:15:00.000000000 -0700
++++ dist/video.js	2019-06-12 08:26:10.000000000 -0700
+@@ -7930,6 +7930,9 @@
+
+             mode = newMode;
+
++            if (mode !== 'disabled' && this.cues.length === 0) {
++              loadTrack(this.src, this);
++            }
+             if (mode !== 'disabled') {
+               this.tech_.ready(function () {
+                 _this2.tech_.on('timeupdate', timeupdateHandler);
+@@ -8022,7 +8025,10 @@
+
+       if (settings.src) {
+         _this.src = settings.src;
+-        loadTrack(settings.src, _assertThisInitialized(_assertThisInitialized(_this)));
++        _this.loaded_ = true;
++        if (default_ || (settings.kind !== 'subtitles' && settings.kind !== 'captions')) {
++          loadTrack(_this.src, _assertThisInitialized(_assertThisInitialized(_this)));
++        }
+       } else {
+         _this.loaded_ = true;
+       }

resources/videojs/video.js

@@ -7930,6 +7930,9 @@
 
             mode = newMode;
 
+            if (mode !== 'disabled' && this.cues.length === 0) {
+              loadTrack(this.src, this);
+            }
             if (mode !== 'disabled') {
               this.tech_.ready(function () {
                 _this2.tech_.on('timeupdate', timeupdateHandler);
@@ -8022,7 +8025,10 @@
 
       if (settings.src) {
         _this.src = settings.src;
-        loadTrack(settings.src, _assertThisInitialized(_assertThisInitialized(_this)));
+        _this.loaded_ = true;
+        if (default_ || (settings.kind !== 'subtitles' && settings.kind !== 'captions')) {
+          loadTrack(_this.src, _assertThisInitialized(_assertThisInitialized(_this)));
+        }
       } else {
         _this.loaded_ = true;
       }