Bug 1493400 - Test av1 video using dav1d has the correct number of frames. r=jya

Differential Revision: https://phabricator.services.mozilla.com/D12637

--HG--
extra : moz-landing-system : lando

dom/media/test/manifest.js

@@ -54,6 +54,7 @@ var gFrameCountTests = [
   { name:"seek-short.webm", type:"video/webm", totalFrameCount:8},
   { name:"seek.webm", type:"video/webm", totalFrameCount:120},
   { name:"320x240.ogv", type:"video/ogg", totalFrameCount:8},
+  { name:"av1.mp4", type:"video/mp4", totalFrameCount:24},
 ];
 
 if (SpecialPowers.Services.appinfo.name != "B2G") {

dom/media/test/test_videoPlaybackQuality_totalFrames.html

@@ -32,7 +32,8 @@ SimpleTest.waitForExplicitFinish();
 SpecialPowers.pushPrefEnv(
   {
     "set": [
-      ["media.decoder.skip-to-next-key-frame.enabled", false]
+      ["media.decoder.skip-to-next-key-frame.enabled", false],
+      ["media.av1.use-dav1d", true]
     ]
   },
   function() {