From 6f4f668531ca9336d36a0343e9a99a82e25a7e41 Mon Sep 17 00:00:00 2001
From: Brian Birtles <birtles@gmail.com>
Date: Tue, 24 Mar 2015 09:21:08 +0900
Subject: [PATCH] Bug 1109390 part 3 - Clear the start time when playing a
 player; r=jwatt

This brings us into line with the algorithm in:

  https://w3c.github.io/web-animations/#play-an-animation

which makes the other patches in this series easier to compare with
the specification.
---
 dom/animation/AnimationPlayer.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dom/animation/AnimationPlayer.cpp b/dom/animation/AnimationPlayer.cpp
index 33b0f64c4ef..9fc5cbfc35e 100644
--- a/dom/animation/AnimationPlayer.cpp
+++ b/dom/animation/AnimationPlayer.cpp
@@ -442,6 +442,9 @@ AnimationPlayer::DoPlay()
   // Clear ready promise. We'll create a new one lazily.
   mReady = nullptr;
 
+  // Clear the start time until we resolve a new one
+  mStartTime.SetNull();
+
   mIsPending = true;
 
   nsIDocument* doc = GetRenderedDocument();