dart:io | Add FileSystemEntity.stat() and FileStat class.

runtime/bin/dartutils.h

Index: runtime/bin/dartutils.h
diff --git a/runtime/bin/dartutils.h b/runtime/bin/dartutils.h
index a9b86f717a86186880706c82275cf5af67161afe..051086b74be8969ff49ae1f6400fef62d0c65947 100644
--- a/runtime/bin/dartutils.h
+++ b/runtime/bin/dartutils.h
@@ -207,6 +207,12 @@ class DartUtils {
 
 class CObject {
  public:
+  // These match the constants in sdk/lib/io/common.dart.
+  static const int kSuccess = 0;
+  static const int kArgumentError = 1;

[Bill Hesse, 2013/05/14 11:34:12]

We could make all but kSuccess private, but kSuccess needs to be public unless
we provide a "Wrapping" function in the CObject API and an unwrap on the Dart
side.

+  static const int kOSError = 2;
+  static const int kFileClosedError = 3;
+
   explicit CObject(Dart_CObject *cobject) : cobject_(cobject) {}
   Dart_CObject::Type type() { return cobject_->type; }
   Dart_CObject::TypedDataType byte_array_type() {
@@ -254,6 +260,9 @@ class CObject {
   static Dart_CObject* NewDouble(double value);
   static Dart_CObject* NewString(int length);
   static Dart_CObject* NewString(const char* str);
+  // A CObject array cannot be returned as the result, since errors are
+  // encoded as arrays starting with a nonzero first element.  It must be
+  // wrapped in an array starting with kSuccess, and unwrapped by the receiver.
   static Dart_CObject* NewArray(int length);
   static Dart_CObject* NewUint8Array(int length);
   static Dart_CObject* NewExternalUint8Array(