From 1ac826c95f8f831da3795c45a847f4bbc0b0acf9 Mon Sep 17 00:00:00 2001
From: bechen <bechen@mozilla.com>
Date: Thu, 18 May 2017 11:02:25 +0800
Subject: [PATCH] Bug 1298307 - Check cue's active state first, then verify
 displaystate. r=alwu,smaug

MozReview-Commit-ID: 4sqPNY9Czsr

--HG--
extra : rebase_source : e612e00520c839c3460d56618b5f3e30e47bc026
---
 dom/media/test/test_webvtt_empty_displaystate.html | 12 ++++++++++--
 dom/webidl/VTTCue.webidl                           |  2 ++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/dom/media/test/test_webvtt_empty_displaystate.html b/dom/media/test/test_webvtt_empty_displaystate.html
index 54de86e61502..42c8008dcc93 100644
--- a/dom/media/test/test_webvtt_empty_displaystate.html
+++ b/dom/media/test/test_webvtt_empty_displaystate.html
@@ -65,11 +65,19 @@ function runTest() {
 
   info("--- add cue ---");
   track.addCue(cue);
-
+  video.ontimeupdate = function () {
+    info("--- video.currentTime is " + video.currentTime);
+  };
   cue.onenter = function () {
     cue.onenter = null;
     isReceivedOnEnterEvent = true;
-    checkCueDisplayState(cue, true /* has display-state */);
+    var cueChrome = SpecialPowers.wrap(cue);
+    info("cueChrome.getActive " + cueChrome.getActive);
+    if (cueChrome.getActive) {
+      checkCueDisplayState(cue, true /* has display-state */);
+    } else {
+      ok(false, "The cue start time is 0, should be always active!?");
+    }
 
     cue.onexit = function () {
       cue.onexit = null;
diff --git a/dom/webidl/VTTCue.webidl b/dom/webidl/VTTCue.webidl
index f74db7a58c71..4f8214c21d96 100644
--- a/dom/webidl/VTTCue.webidl
+++ b/dom/webidl/VTTCue.webidl
@@ -68,4 +68,6 @@ partial interface VTTCue {
   readonly attribute double computedPosition;
   [ChromeOnly]
   readonly attribute PositionAlignSetting computedPositionAlign;
+  [ChromeOnly]
+  readonly attribute boolean getActive;
 };