Start using Dart_PropagateError in the runtime/bin directory.

runtime/bin/dartutils.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 BIN_DARTUTILS_H_
 #define BIN_DARTUTILS_H_
 
 #include "bin/builtin.h"
 #include "include/dart_api.h"
 #include "platform/globals.h"
@@ skipping 38 matching lines @@
   void operator=(const CommandLineOptions&);
 
   int count_;
   int max_count_;
   const char** arguments_;
 };
 
 
 class DartUtils {
  public:
+  // TODO(turnidge): Clean up the implementations of these so that
+  // they allow for proper error propagation.
   static int64_t GetIntegerValue(Dart_Handle value_obj);
   static const char* GetStringValue(Dart_Handle str_obj);
   static bool GetBooleanValue(Dart_Handle bool_obj);
   static void SetIntegerField(Dart_Handle handle,
                               const char* name,
                               intptr_t val);
   static intptr_t GetIntegerField(Dart_Handle handle,
                                   const char* name);
   static void SetStringField(Dart_Handle handle,
                              const char* name,
@@ skipping 202 matching lines @@
 
 class CObjectByteArray : public CObject {
  public:
   DECLARE_COBJECT_CONSTRUCTORS(ByteArray)
 
   int Length() const { return cobject_->value.as_byte_array.length; }
   uint8_t* Buffer() const { return cobject_->value.as_byte_array.values; }
 };
 
 #endif  // BIN_DARTUTILS_H_