Support piping log data over the service protocol

sdk/lib/developer/developer.dart

 // Copyright (c) 2015, 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.
 
 /// Interact with developer tools such as the debugger and inspector.
 ///
 /// The dart:developer library is _unstable_ and its API might change slightly
 /// as a result of developer feedback. This library is platform dependent and
 /// therefore it has implementations for both dart2js and the Dart VM. Both are
 /// under development and may not support all operations yet.
 ///
 library dart.developer;
 
+import 'dart:async';
 import 'dart:convert';
 
 part 'profiler.dart';
 
 /// If [when] is true, stop the program as if a breakpoint were hit at the
 /// following statement.
-/// 
+///
 /// Returns the value of [when]. Some debuggers may
 /// display [msg].
-/// 
+///
 /// NOTE: When invoked, the isolate will not return until a debugger
 /// continues execution. When running in the Dart VM the behaviour is the same
 /// regardless of whether or not a debugger is connected. When compiled to
 /// JavaScript, this uses the "debugger" statement, and behaves exactly as
 /// that does.
 external bool debugger({bool when: true, String msg});
 
 /// Send a reference to [object] to any attached debuggers.
-/// 
+///
 /// Debuggers may open an inspector on the object. Returns the argument.
 external inspect(object);
+
+/// Emit a log event.
+/// [sequenceNumber] is a monotonically increasing sequence number.
+/// [millisececondsSinceEpoch] is a timestamp.
+/// [level] is the severity level (value between 0 and 2000 inclusive).
+/// [name] is the name of the source of the log message.
+/// [message] is the log message.
+/// [zone] (optional) the zone where the log was emitted
+/// [error] (optional) an error object associated with this log event.
+/// [stackTrace] (optional) a stack trace associated with this log event.
+external log(int sequenceNumber,
+             int millisecondsSinceEpoch,
+             int level,
+             String name,
+             String message,
+             [Zone zone,
+              Object error,
+              StackTrace stackTrace]);
+
+/// Emit a log event for a a [LogRecord] from the [logging] package.
+void logOnRecord(dynamic logRecord) {
+  log(logRecord.sequenceNumber,
+      logRecord.time.millisecondsSinceEpoch,
+      logRecord.level.value,
+      logRecord.loggerName,
+      logRecord.message,
+      null,
+      logRecord.error,
+      logRecord.stackTrace);
+}