[IndexedDB] Adding transaction and value support to observers

third_party/WebKit/LayoutTests/storage/indexeddb/resources/generic-idb-operations.js

 if (this.importScripts) {
     importScripts('../../../resources/testharness.js');
 }
 
 function compareChanges(actual, expected) {
   assert_equals(actual.database.name, expected.dbName, 'The change record database should be the same as the database being acted on');
   var stores = Object.keys(expected.records);
   assert_equals(actual.records.size, stores.length, 'Incorrect number of objectStores recorded by observer');
 
+  var storesStr = Array.from(actual.records.keys()).join(", ");
   for (var i in stores) {
     var key = stores[i];
-    assert_true(actual.records.has(key));
+    assert_true(actual.records.has(key), "Store '" + key + "' not found in changes. Stores: " + storesStr);
     var actual_obsv = actual.records.get(key);
     var expected_obsv = expected.records[key];
     assert_equals(actual_obsv.length, expected_obsv.length, 'Number of observations recorded for objectStore '+ key + ' should match observed operations');
     for (var j in expected_obsv)
       compareObservations(actual_obsv[j], expected_obsv[j]);
   }
 }
 
 function compareObservations(actual, expected) {
   assert_equals(actual.type, expected.type);
   assert_not_equals(actual.type, 'kDelete');
   if (actual.type == 'clear') {
     assert_equals(actual.key, undefined, 'clear operation has no key');
     assert_equals(actual.value, null, 'clear operation has no value');
     return;
   }
   if (actual.type == 'delete') {
     assert_equals(actual.key.lower, expected.key.lower, 'Observed operation key lower bound should match operation performed');
     assert_equals(actual.key.upper, expected.key.upper, 'Observed operation key upper bound should match operation performed');
     assert_equals(actual.key.lower_open, expected.key.lower_open, 'Observed operation key lower open should match operation performed');
     assert_equals(actual.key.upper_open, expected.key.upper_open, 'Observed operation key upper open should match operation performed');
     // TODO(dmurph): Value needs to be updated, once returned correctly. Issue crbug.com/609934.
     assert_equals(actual.value, null, 'Delete operation has no value');
     return;
   }
   assert_equals(actual.key.lower, expected.key, 'Observed operation key lower bound should match operation performed');
   assert_equals(actual.key.upper, expected.key, 'Observed operation key upper bound should match operation performed');
-  // TODO(dmurph): Value needs to be updated, once returned correctly. Issue crbug.com/609934.
-  assert_equals(actual.value, null, 'Put/Add operation value does not match');
+  if (expected.value != undefined) {
+    assert_equals(actual.value, expected.value, 'Put/Add operation value does not match');
+  } else {
+    // TODO(dmurph): Value needs to be updated, once returned correctly. Issue crbug.com/609934.
+    assert_equals(actual.value, null, 'Put/Add operation has unexpected value');
+  }
 }
 
 function countCallbacks(actual, expected) {
   assert_equals(actual, expected, 'Number of callbacks fired for observer should match number of transactions it observed')
 }