Add a mid-sized integration test for the Dart Embedding Api which

runtime/include/dart_api.h

Index: runtime/include/dart_api.h
===================================================================
--- runtime/include/dart_api.h	(revision 1762)
+++ runtime/include/dart_api.h	(working copy)
@@ -445,6 +445,16 @@
 // TODO(turnidge): Should this be removed from the public api?
 
 /**
+ * Gets the main Dart_Port for the current isolate.

[Anton Muhin, 2011/11/23 19:28:14]

nit: 'main' sounds too generic to me at least.

[turnidge, 2011/11/23 21:45:37]

What do you think it should be called?  Open to suggestions.  Whatever the name
is, it is good if it is simple.

+ */
+DART_EXPORT Dart_Port Dart_GetMainPort();
+
+/**
+ * Does the current isolate have active ports?
+ */
+DART_EXPORT bool Dart_IsolateHasActivePorts();
+
+/**
  * Posts a message for some isolate. The message is built from a raw
  * array.
  *
@@ -473,6 +483,16 @@
  */
 DART_EXPORT bool Dart_Post(Dart_Port port, Dart_Handle object);
 
+/**
+ * Returns a new SendPort with the provided id.
+ */
+DART_EXPORT Dart_Handle Dart_NewSendPort(Dart_Port port);
+
+/**
+ * Returns a new ReceivePort with the provided id.
+ */
+DART_EXPORT Dart_Handle Dart_NewReceivePort(Dart_Port port);
+
 // --- Scopes ----
 
 /**