Add parsing for interface declarations

src/parsing/parser.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/parsing/parser.h"
 
 #include "src/api.h"
 #include "src/ast/ast.h"
 #include "src/ast/ast-expression-rewriter.h"
 #include "src/ast/ast-expression-visitor.h"
@@ skipping 1271 matching lines @@
         return ParseVariableStatement(kStatementListItem, NULL, ok);
       }
       break;
     case Token::VAR:
       return ParseVariableStatement(kStatementListItem, NULL, ok);
     case Token::LET:
       if (IsNextLetKeyword()) {
         return ParseVariableStatement(kStatementListItem, NULL, ok);
       }
       break;
-    case Token::IDENTIFIER: {
+    case Token::IDENTIFIER:
+    case Token::FUTURE_STRICT_RESERVED_WORD: {
       if (!scope_->typed()) break;
       int pos = peek_position();
       if (CheckContextualKeyword(CStrVector("type"))) {
         return ParseTypeAliasDeclaration(pos, ok);
+      } else if (CheckContextualKeyword(CStrVector("interface"))) {
+        return ParseInterfaceDeclaration(pos, ok);
       }
       break;
     }
-    // TODO(nikolaos): interface
     // TODO(nikolaos): ambient
     default:
       break;
   }
   return ParseStatement(NULL, ok);
 }
 
 
 Statement* Parser::ParseModuleItem(bool* ok) {
   // (Ecma 262 6th Edition, 15.2):
@@ skipping 5711 matching lines @@
                         try_block, target);
     final_loop = target;
   }
 
   return final_loop;
 }
 
 
 }  // namespace internal
 }  // namespace v8