Big merge from experimental to bleeding edge.

sdk/lib/io/process.dart

Index: sdk/lib/io/process.dart
diff --git a/sdk/lib/io/process.dart b/sdk/lib/io/process.dart
index 34e0140a751a5f1585d765cc6a6f5c2a083172b0..4bbb98da5845227077c6f637049a52f0606bd056 100644
--- a/sdk/lib/io/process.dart
+++ b/sdk/lib/io/process.dart
@@ -42,7 +42,7 @@ set exitCode(int status) {
  * [Process] is used to start new processes using the static
  * [start] and [run] methods.
  */
-abstract class Process {
+abstract class Process extends StreamSink {
   /**
    * Starts a process running the [executable] with the specified
    * [arguments]. Returns a [:Future<Process>:] that completes with a
@@ -102,6 +102,10 @@ abstract class Process {
    */
   OutputStream get stdin;
 
+
+  Stream<List<int>> get stdoutStream;
+  Stream<List<int>> get stderrStream;
+
   /**
    * Sets an exit handler which gets invoked when the process
    * terminates.