Fix BaseAudioContext::hasPendingActivity() to make it GCed correctly

third_party/WebKit/LayoutTests/webaudio/resources/audio-testing.js

 /* global self */
 
 // testharness.js has the higher priority.
 var TESTHARNESS = true;
 var JSTEST = false;
 
 (function () {
     // Selected properies from testharness.js
     var testharnessProperties = [
         'test', 'async_test', 'promise_test', 'promise_rejects',
@@ skipping 579 matching lines @@
             test(function () {
                 assert_true(false, failureMessage + failureDetail);
             }, this.desc)
         } else {
             testFailed(failureMessage + failureDetail);
         }
 
         throw failureMessage;
     };
 
+    // Check if |target| does exist. (not undefined nor null)
+    //
+    // Example:
+    // Should('null', null).exist();
+    // Result:
+    // "FAIL null does not exist."
+    ShouldModel.prototype.exist = function () {
+        if (this.target !== null && this.target !== undefined) {
+            this._testPassed('exist');
+        } else {
+            this._testFailed('does not exist');
+        }
+    };
+
     // Check if |target| is equal to |value|.
     //
     // Example:
     // Should('Zero', 0).beEqualTo(0);
     // Result:
     // "PASS Zero is equal to 0."
     ShouldModel.prototype.beEqualTo = function (value) {
         if (value != null) {
             var type = typeof value;
             this._assert(type === 'number' || type === 'string' || type === 'boolean',
@@ skipping 567 matching lines @@
             if (opts.hasOwnProperty('brief'))
                 _opts.brief = opts.brief;
             if (opts.hasOwnProperty('precision'))
                 _opts.precision = opts.precision;
         }
 
         return new ShouldModel(desc, target, _opts);
     };
 
 })();