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

sdk/lib/web_sql/dartium/web_sql_dartium.dart

 /**
  * An API for storing data in the browser that can be queried with SQL.
  *
  * **Caution:** this specification is no longer actively maintained by the Web
  * Applications Working Group and may be removed at any time.
  * See [the W3C Web SQL Database specification](http://www.w3.org/TR/webdatabase/)
  * for more information.
  *
  * The [dart:indexed_db] APIs is a recommended alternatives.
  */
@@ skipping 100 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory SqlDatabase._internalWrap() {
     return new SqlDatabase.internal_();
   }
 
   SqlDatabase.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   /// Checks if this type is supported on the current platform.
   static bool get supported => true;
 
   @DomName('Database.version')
   @DocsEditable()
   String get version => _blink.BlinkDatabase.instance.version_Getter_(unwrap_jso(this));
   
   void changeVersion(String oldVersion, String newVersion, [SqlTransactionCallback callback, SqlTransactionErrorCallback errorCallback, VoidCallback successCallback]) {
     if (successCallback != null) {
@@ skipping 60 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory SqlError._internalWrap() {
     return new SqlError.internal_();
   }
 
   SqlError.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   @DomName('SQLError.CONSTRAINT_ERR')
   @DocsEditable()
   static const int CONSTRAINT_ERR = 6;
 
   @DomName('SQLError.DATABASE_ERR')
   @DocsEditable()
   static const int DATABASE_ERR = 1;
 
   @DomName('SQLError.QUOTA_ERR')
@@ skipping 50 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory SqlResultSet._internalWrap() {
     return new SqlResultSet.internal_();
   }
 
   SqlResultSet.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   @DomName('SQLResultSet.insertId')
   @DocsEditable()
   int get insertId => _blink.BlinkSQLResultSet.instance.insertId_Getter_(unwrap_jso(this));
   
   @DomName('SQLResultSet.rows')
   @DocsEditable()
   SqlResultSetRowList get rows => wrap_jso(_blink.BlinkSQLResultSet.instance.rows_Getter_(unwrap_jso(this)));
   
   @DomName('SQLResultSet.rowsAffected')
@@ skipping 22 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory SqlResultSetRowList._internalWrap() {
     return new SqlResultSetRowList.internal_();
   }
 
   SqlResultSetRowList.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   @DomName('SQLResultSetRowList.length')
   @DocsEditable()
   int get length => _blink.BlinkSQLResultSetRowList.instance.length_Getter_(unwrap_jso(this));
   
   Map operator[](int index) {
     if (index < 0 || index >= length)
       throw new RangeError.index(index, this);
     return _blink.BlinkSQLResultSetRowList.instance.item_Callback_1_(unwrap_jso(this), index);
   }
@@ skipping 67 matching lines @@
 
   js.JsObject blink_jsObject = null;
 
   factory SqlTransaction._internalWrap() {
     return new SqlTransaction.internal_();
   }
 
   SqlTransaction.internal_() { }
 
   bool operator ==(other) => unwrap_jso(other) == unwrap_jso(this) || identical(this, other);
+  int get hashCode => unwrap_jso(this).hashCode;
 
   @DomName('SQLTransaction.executeSql')
   @DocsEditable()
   void executeSql(String sqlStatement, List<Object> arguments, [SqlStatementCallback callback, SqlStatementErrorCallback errorCallback]) => _blink.BlinkSQLTransaction.instance.executeSql_Callback_4_(unwrap_jso(this), sqlStatement, arguments, unwrap_jso(callback), unwrap_jso(errorCallback));
   
 }