[Android, Video, Autoplay] Only autoplay muted videos, ignore audio tags.

third_party/WebKit/LayoutTests/media/autoplay-muted.html

Index: third_party/WebKit/LayoutTests/media/autoplay-muted.html
diff --git a/third_party/WebKit/LayoutTests/media/autoplay-muted.html b/third_party/WebKit/LayoutTests/media/autoplay-muted.html
index e0b5926b5d75ddd2587fc0b5ba9caa570f8af721..7338c01f56c619e0bd1a2522c60e028c3e69ebf1 100644
--- a/third_party/WebKit/LayoutTests/media/autoplay-muted.html
+++ b/third_party/WebKit/LayoutTests/media/autoplay-muted.html
@@ -17,13 +17,21 @@
     window.internals.runtimeFlags.autoplayMutedVideosEnabled = true;
     testRunner.setAutoplayAllowed(true);
 
-    function createMutedVideoElement() {
-        var e = document.createElement('video');
-        e.src = findMediaFile('video', 'content/test');
+    function createMutedMediaElement(type) {
+        var e = document.createElement(type);
+        e.src = findMediaFile(type, 'content/test');
         e.muted = true;
         return e;
     }
 
+    function createMutedVideoElement() {
+        return createMutedMediaElement('video');
+    }
+
+    function createMutedAudioElement() {
+        return createMutedMediaElement('audio');
+    }
+
     async_test(function(t) {
         var e = createMutedVideoElement();
         e.autoplay = true;
@@ -40,6 +48,26 @@
         return createMutedVideoElement().play();
     }, "Test that play() on a muted video succeeds without gesture.");
 
+    promise_test(function (t) {
+        return promise_rejects(
+            t,
+            new DOMException(
+                'play() can only be initiated by a user gesture.',
+                'NotAllowedError'),
+            createMutedAudioElement().play());
+    }, "Test that play() on a muted audio without gesture will reject.");
+
+    async_test(function (t) {
+        var e = createMutedAudioElement();
+        e.autoplay = true;
+        e.onplay = t.unreached_func();
+        e.oncanplaythrough = t.step_func(function() {
+            setTimeout(t.step_func_done(function() {
+                assert_true(e.paused);
+            }), 0);
+        });
+    }, "Test that autoplay on a muted audio without gesture has no effect.");
+
     promise_test(function(t) {
         var e = createMutedVideoElement();
         return e.play().then(t.step_func_done(function() {