[eme] Convert lifetime tests to promise_tests

third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release.html

Index: third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release.html
diff --git a/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release.html b/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release.html
index 39d3db1e4d38ec2a307f1f087aa147432f019aab..689aec52d247adc22a9dc21795beae70b36caa5d 100644
--- a/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release.html
+++ b/third_party/WebKit/LayoutTests/media/encrypted-media/encrypted-media-lifetime-mediakeysession-release.html
@@ -12,49 +12,40 @@
             //   JavaScript has a reference to it
             //   OR (MediaKeys is around
             //       AND the session has not received a close() event)
-            async_test(function(test)
+            promise_test(function(test)
             {
-                gc();
                 var mediaKeys;
                 var mediaKeySession1;
                 var mediaKeySession2;
                 var initDataType;
                 var initData;
-                var startingMediaKeysCount = window.internals.mediaKeysCount();
-                var startingMediaKeySessionCount = window.internals.mediaKeySessionCount();
-
-                function numMediaKeysCreated()
-                {
-                    return window.internals.mediaKeysCount() - startingMediaKeysCount;
-                }
-
-                function numMediaKeySessionCreated()
-                {
-                    return window.internals.mediaKeySessionCount() - startingMediaKeySessionCount;
-                }
 
                 // Create 2 sessions.
-                navigator.requestMediaKeySystemAccess('org.w3.clearkey', getSimpleConfiguration()).then(function(access) {
+                // Even though there should be no existing objects, start by
+                // running gc() and verifying that none exist. This also
+                // allows the failures to be reported from inside a promise
+                // so that the test fails properly.
+                return createGCPromise().then(function() {
+                    verifyMediaKeyAndMediaKeySessionCount(0, 0, 'After initial gc()');
+
+                    return navigator.requestMediaKeySystemAccess('org.w3.clearkey', getSimpleConfiguration());
+                }).then(function(access) {
                     initDataType = access.getConfiguration().initDataTypes[0];
                     initData = getInitData(initDataType);
                     return access.createMediaKeys();
                 }).then(function(result) {
                     mediaKeys = result;
-
-                    assert_equals(numMediaKeysCreated(), 1, 'MediaKeys.create()');
-                    assert_equals(numMediaKeySessionCreated(), 0, 'MediaKeys.create()');
+                    verifyMediaKeyAndMediaKeySessionCount(1, 0, 'MediaKeys.create()');
 
                     mediaKeySession1 = mediaKeys.createSession();
                     return mediaKeySession1.generateRequest(initDataType, initData);
                 }).then(function() {
-                    assert_equals(numMediaKeysCreated(), 1, 'MediaKeys.createSession(1)');
-                    assert_equals(numMediaKeySessionCreated(), 1, 'MediaKeys.createSession(1)');
+                    verifyMediaKeyAndMediaKeySessionCount(1, 1, 'MediaKeys.createSession(1)');
 
                     mediaKeySession2 = mediaKeys.createSession();
                     return mediaKeySession2.generateRequest(initDataType, initData);
                 }).then(function() {
-                    assert_equals(numMediaKeysCreated(), 1, 'mediaKeys.createSession(2)');
-                    assert_equals(numMediaKeySessionCreated(), 2, 'mediaKeys.createSession(2)');
+                    verifyMediaKeyAndMediaKeySessionCount(1, 2, 'mediaKeys.createSession(2)');
 
                     // Close the sessions. Once completed, only the JS
                     // reference to them keeps them around.
@@ -65,23 +56,17 @@
                     // Since both sessions have been closed, dropping the
                     // reference to them from JS will result in the session
                     // being garbage-collected.
-                    assert_equals(numMediaKeysCreated(), 1, 'after close');
-                    assert_equals(numMediaKeySessionCreated(), 2, 'after close');
+                    verifyMediaKeyAndMediaKeySessionCount(1, 2, 'after close');
 
                     mediaKeySession1 = null;
                     return createGCPromise();
                 }).then(function() {
-                    assert_equals(numMediaKeysCreated(), 1, 'mediaKeySession1 not collected');
-                    assert_equals(numMediaKeySessionCreated(), 1, 'mediaKeySession1 not collected');
+                    verifyMediaKeyAndMediaKeySessionCount(1, 1, 'mediaKeySession1 not collected');
 
                     mediaKeySession2 = null;
                     return createGCPromise();
                 }).then(function() {
-                    assert_equals(numMediaKeysCreated(), 1, 'mediaKeySession2 not collected');
-                    assert_equals(numMediaKeySessionCreated(), 0, 'mediaKeySession2 not collected');
-                    test.done();
-                }).catch(function(error) {
-                    forceTestFailureFromPromise(test, error);
+                    verifyMediaKeyAndMediaKeySessionCount(1, 0, 'mediaKeySession2 not collected');
                 });
             }, 'MediaKeySession lifetime after release()');
         </script>