Add optional message argument to assert statements in the VM.

runtime/vm/parser.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_PARSER_H_
 #define RUNTIME_VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "platform/assert.h"
@@ skipping 841 matching lines @@
                               AstNode* lhs,
                               AstNode* rhs);
   LetNode* PrepareCompoundAssignmentNodes(AstNode** expr);
   LocalVariable* CreateTempConstVariable(TokenPosition token_pos,
                                          const char* s);
 
   static SequenceNode* NodeAsSequenceNode(TokenPosition sequence_pos,
                                           AstNode* node,
                                           LocalScope* scope);
 
+  AstNode* MakeAssertCall(TokenPosition begin,
+                          TokenPosition end,
+                          AstNode* message);
   SequenceNode* MakeImplicitConstructor(const Function& func);
   AstNode* MakeStaticCall(const String& cls_name,
                           const String& func_name,
                           ArgumentListNode* arguments);
   String& Interpolate(const GrowableArray<AstNode*>& values);
   AstNode* ThrowTypeError(TokenPosition type_pos,
                           const AbstractType& type,
                           LibraryPrefix* prefix = NULL);
   AstNode* ThrowNoSuchMethodError(TokenPosition call_pos,
                                   const Class& cls,
@@ skipping 102 matching lines @@
 
   intptr_t recursion_counter_;
   friend class RecursionChecker;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_PARSER_H_