Add a hashCode that delegates to JS for everything that defines ==

sdk/lib/indexed_db/dartium/indexed_db_dartium.dart

 /**
  * A client-side key-value store with support for indexes.
  *
  * Many browsers support IndexedDB—a web standard for
  * an indexed database.
  * By storing data on the client in an IndexedDB,
  * a web app gets some advantages, such as faster performance and persistence.
  * To find out which browsers support IndexedDB,
  * refer to [Can I Use?](http://caniuse.com/#feat=indexeddb)
  *
@@ skipping 161 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory Cursor._internalWrap() {
     return new Cursor.internal_();
   }
 
   Cursor.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   @DomName('IDBCursor.direction')
   @DocsEditable()
   String get direction => _blink.BlinkIDBCursor.instance.direction_Getter_(unwrap_jso(this));
   
   @DomName('IDBCursor.key')
   @DocsEditable()
   Object get key => _blink.BlinkIDBCursor.instance.key_Getter_(unwrap_jso(this));
   
   @DomName('IDBCursor.primaryKey')
@@ skipping 340 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory IdbFactory._internalWrap() {
     return new IdbFactory.internal_();
   }
 
   IdbFactory.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   @DomName('IDBFactory.cmp')
   @DocsEditable()
   int cmp(Object first, Object second) => _blink.BlinkIDBFactory.instance.cmp_Callback_2_(unwrap_jso(this), first, second);
   
   @DomName('IDBFactory.deleteDatabase')
   @DocsEditable()
   OpenDBRequest _deleteDatabase(String name) => _blink.BlinkIDBFactory.instance.deleteDatabase_Callback_1_(unwrap_jso(this), name);
   
   OpenDBRequest _open(String name, [int version]) {
@@ skipping 132 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory Index._internalWrap() {
     return new Index.internal_();
   }
 
   Index.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   @DomName('IDBIndex.keyPath')
   @DocsEditable()
   Object get keyPath => _blink.BlinkIDBIndex.instance.keyPath_Getter_(unwrap_jso(this));
   
   @DomName('IDBIndex.multiEntry')
   @DocsEditable()
   bool get multiEntry => _blink.BlinkIDBIndex.instance.multiEntry_Getter_(unwrap_jso(this));
   
   @DomName('IDBIndex.name')
@@ skipping 70 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory KeyRange._internalWrap() {
     return new KeyRange.internal_();
   }
 
   KeyRange.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   @DomName('IDBKeyRange.lower')
   @DocsEditable()
   Object get lower => _blink.BlinkIDBKeyRange.instance.lower_Getter_(unwrap_jso(this));
   
   @DomName('IDBKeyRange.lowerOpen')
   @DocsEditable()
   bool get lowerOpen => _blink.BlinkIDBKeyRange.instance.lowerOpen_Getter_(unwrap_jso(this));
   
   @DomName('IDBKeyRange.upper')
@@ skipping 178 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory ObjectStore._internalWrap() {
     return new ObjectStore.internal_();
   }
 
   ObjectStore.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   @DomName('IDBObjectStore.autoIncrement')
   @DocsEditable()
   bool get autoIncrement => _blink.BlinkIDBObjectStore.instance.autoIncrement_Getter_(unwrap_jso(this));
   
   @DomName('IDBObjectStore.indexNames')
   @DocsEditable()
   List<String> get indexNames => _blink.BlinkIDBObjectStore.instance.indexNames_Getter_(unwrap_jso(this));
   
   @DomName('IDBObjectStore.keyPath')
@@ skipping 394 matching lines @@
   
   @DomName('IDBVersionChangeEvent.newVersion')
   @DocsEditable()
   int get newVersion => _blink.BlinkIDBVersionChangeEvent.instance.newVersion_Getter_(unwrap_jso(this));
   
   @DomName('IDBVersionChangeEvent.oldVersion')
   @DocsEditable()
   int get oldVersion => _blink.BlinkIDBVersionChangeEvent.instance.oldVersion_Getter_(unwrap_jso(this));
   
 }