IntersectionObserver: second cut.

third_party/WebKit/LayoutTests/resources/js-test.js

 // js-test now supports lazily printing test results which dumps all test
 // results once at the end of the test instead of building them up. To enable
 // this option, call setPrintTestResultsLazily() before running any tests.
 var _lazyTestResults; // Set by setPrintTestResultsLazily().
 
 // svg/dynamic-updates tests set enablePixelTesting=true, as we want to dump text + pixel results
 if (self.testRunner) {
     if (self.enablePixelTesting)
         testRunner.dumpAsTextWithPixelResults();
     else
@@ skipping 498 matching lines @@
     if (opt_tolerance)
         shouldBeCloseTo(actual, expected, opt_tolerance);
     else
         shouldBe(actual, stringify(expected));
   } else {
     debug(expected + " is unknown type " + typeof expected);
     shouldBeTrue(actual, "'"  +expected.toString() + "'");
   }
 }
 
+function shouldEvaluateToSameObject(actual, expected, quiet) {
+  if (typeof actual != "string")
+    debug("WARN: shouldEvaluateToSameObject() expects the first argument (actual) to be a string.");
+  try {
+    actualEvaled = eval(actual);
+  } catch (e) {
+    testFailed("Evaluating " + actual + ": Threw exception " + e);
+    return;
+  }
+  if (isResultCorrect(actualEvaled, expected)) {
+    if (!quiet)
+      testPassed(actual + " is " + stringify(expected));
+  } else {
+    testFailed(actual + " should be " + stringify(expected) + ". Was " + stringify(actualEvaled));
+  }
+}
+
 function shouldBeNonZero(_a)
 {
   var _exception;
   var _av;
   try {
      _av = eval(_a);
   } catch (e) {
      _exception = e;
   }
 
@@ skipping 363 matching lines @@
     testPassed = function(msg) {
         workerPort.postMessage('PASS:' + msg);
     };
     finishJSTest = function() {
         workerPort.postMessage('DONE:');
     };
     debug = function(msg) {
         workerPort.postMessage(msg);
     };
 }