Cleanup tests related to controls hiding/fading in/out

LayoutTests/media/media-controls.js

Index: LayoutTests/media/media-controls.js
diff --git a/LayoutTests/media/media-controls.js b/LayoutTests/media/media-controls.js
index 30da5ba7c7f3eaff3f03266baf70c73687df2b4d..6a3c87d10ca7b5c0c72935edd613c9256cd0d98d 100644
--- a/LayoutTests/media/media-controls.js
+++ b/LayoutTests/media/media-controls.js
@@ -1,6 +1,16 @@
 var captionsButtonElement;
 var captionsButtonCoordinates;
 
+// These reflect the values used to fade in/out the media controls. Should
+// mirror the values 'fadeInDuration'/'fadeOutDuration' in MediaControlElements.cpp.
+const controlsFadeInDurationMs = 100;
+const controlsFadeOutDurationMs = 300;
+
+// The timeout for the hide-after-no-mouse-movement behavior. Defined (and
+// should mirror) the value 'timeWithoutMouseMovementBeforeHidingMediaControls'
+// in MediaControls.cpp.
+const controlsMouseMovementTimeoutMs = 3000;
+
 function mediaControlsElement(first, id)
 {
     for (var element = first; element; element = element.nextSibling) {
@@ -109,3 +119,19 @@ function clickCCButton()
     eventSender.mouseDown();
     eventSender.mouseUp();
 }
+
+function runAfterControlsHidden(func, mediaElement)
+{
+    if (mediaElement.paused)
+        throw "The media element is not playing";
+
+    // Compute the time it'll take until the controls will be invisible -
+    // assuming playback has been started prior to invoking this
+    // function. Allow 500ms slack.
+    var hideTimeoutMs = controlsMouseMovementTimeoutMs + controlsFadeOutDurationMs + 500;
+
+    if (!mediaElement.loop && hideTimeoutMs >= 1000 * (mediaElement.duration - mediaElement.currentTime))
+        throw "The media will end before the controls have been hidden";
+
+    setTimeout(func, hideTimeoutMs);
+}