Attempting to fix indexed_db IE10 test timeouts.

tests/html/indexeddb_1_test.dart

 library IndexedDB1Test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:async';
 import 'dart:html' as html;
 import 'dart:indexed_db' as idb;
 
-const String DB_NAME = 'Test';
 const String STORE_NAME = 'TEST';
 const int VERSION = 1;
 
+var databaseNameIndex = 0;
+String nextDatabaseName() {
+  return 'Test1_${databaseNameIndex++}';
+}
+
 Future testUpgrade() {
-  var dbName = 'version_db';
+  var dbName = nextDatabaseName();
   var upgraded = false;
 
   // Delete any existing DBs.
   return html.window.indexedDB.deleteDatabase(dbName).then((_) {
 
       return html.window.indexedDB.open(dbName, version: 1,
           onUpgradeNeeded: (e) {});
     }).then((db) {
       db.close();
     }).then((_) {
       return html.window.indexedDB.open(dbName, version: 2,
           onUpgradeNeeded: (e) {
             // Bug 8265, we're getting the wrong type here.
             //expect(e.oldVersion, 1);
             //expect(e.newVersion, 2);
             upgraded = true;
           });
     }).then((_) {
       expect(upgraded, isTrue);
     });
 }
 
 testReadWrite(key, value, matcher,
-    [dbName = DB_NAME, storeName = STORE_NAME, version = VERSION]) => () {
+    [dbName, storeName = STORE_NAME, version = VERSION]) => () {
+  if (dbName == null) {
+    dbName = nextDatabaseName();
+  }
   createObjectStore(e) {
     var store = e.target.result.createObjectStore(storeName);
     expect(store, isNotNull);
   }
 
   var db;
   return html.window.indexedDB.deleteDatabase(dbName).then((_) {
       return html.window.indexedDB.open(dbName, version: version,
           onUpgradeNeeded: createObjectStore);
     }).then((result) {
       db = result;
       var transaction = db.transaction([storeName], 'readwrite');
       transaction.objectStore(storeName).put(value, key);
       return transaction.completed;
     }).then((_) {
       var transaction = db.transaction(storeName, 'readonly');
       return transaction.objectStore(storeName).getObject(key);
     }).then((object) {
       db.close();
       expect(object, matcher);
     }).whenComplete(() {
       if (db != null) {
         db.close();
       }
+      return html.window.indexedDB.deleteDatabase(dbName);
     });
 };
 
 testReadWriteTyped(key, value, matcher,
-    [dbName = DB_NAME, storeName = STORE_NAME, version = VERSION]) => () {
+    [dbName, storeName = STORE_NAME, version = VERSION]) => () {
+  if (dbName == null) {
+    dbName = nextDatabaseName();
+  }
   void createObjectStore(e) {
     var store = e.target.result.createObjectStore(storeName);
     expect(store, isNotNull);
   }
 
   idb.Database db;
   // Delete any existing DBs.
   return html.window.indexedDB.deleteDatabase(dbName).then((_) {
       return html.window.indexedDB.open(dbName, version: version,
         onUpgradeNeeded: createObjectStore);
     }).then((idb.Database result) {
       db = result;
       idb.Transaction transaction = db.transaction([storeName], 'readwrite');
       transaction.objectStore(storeName).put(value, key);
 
       return transaction.completed;
     }).then((idb.Database result) {
       idb.Transaction transaction = db.transaction(storeName, 'readonly');
       return transaction.objectStore(storeName).getObject(key);
     }).then((object) {
       db.close();
       expect(object, matcher);
     }).whenComplete(() {
       if (db != null) {
         db.close();
       }
+      return html.window.indexedDB.deleteDatabase(dbName);
     });
 };
 
 tests_dynamic() {
   test('test1', testReadWrite(123, 'Hoot!', equals('Hoot!')));
   test('test2', testReadWrite(123, 12345, equals(12345)));
   test('test3', testReadWrite(123, [1, 2, 3], equals([1, 2, 3])));
   test('test4', testReadWrite(123, [2, 3, 4], equals([2, 3, 4])));
   test('test4', testReadWrite(123, false, equals(false)));
 }
@@ skipping 35 matching lines @@
     });
 
     // Don't bother with these tests if it's unsupported.
     if (idb.IdbFactory.supported) {
       test('upgrade', testUpgrade);
       tests_dynamic();
       tests_typed();
     }
   });
 }