Add a web platform test for APNG

While animated-png.html uses internals for selecting frames and verifying that we decode APNGs properly, this test confirms that a basic animation will work correctly, and can work in other browsers. - apng.png A simple APNG with two frames. The first frame is red, and displays for as short a time as possible (11 ms; anything less than that and Chromium increases the time), followed by a green frame. The image does not loop. The green frame matches green.png, which already exists - animated-png-timeout-ref.html Reference page showing the existing image (green.png). BUG=437662 Review-Url: https://codereview.chromium.org/2814453004 Cr-Commit-Position: refs/heads/master@{#464038}
servo · Apr 12, 2017 · 0a441e3 · 0a441e3
1 parent 6962792
commit 0a441e3
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diff --git a/apng/animated-png-timeout-ref.html b/apng/animated-png-timeout-ref.html
@@ -0,0 +1 @@
+<img src=../images/green.png>
diff --git a/apng/animated-png-timeout.html b/apng/animated-png-timeout.html
@@ -0,0 +1,11 @@
+<html class="reftest-wait">
+<title>APNG: Second frame displays quickly, replacing red with green.</title>
+<link rel="match" href="animated-png-timeout-ref.html"/>
+<img src=../images/apng.png onload="loaded()"/>
+<script>
+  function loaded() {
+    setTimeout(function() {
+      document.documentElement.classList.remove("reftest-wait");
+    }, 1000);
+  }
+</script>
diff --git a/images/apng.png b/images/apng.png
diff --git a/lint.whitelist b/lint.whitelist
@@ -145,6 +145,7 @@ TRAILING WHITESPACE:webgl/tools/*.patch
 SET TIMEOUT: *-manual.*
 SET TIMEOUT: 2dcontext/*
 SET TIMEOUT: annotation-model/scripts/ajv.min.js
+SET TIMEOUT: apng/animated-png-timeout.html
 SET TIMEOUT: cookies/resources/testharness-helpers.js
 SET TIMEOUT: common/reftest-wait.js
 SET TIMEOUT: conformance-checkers/*