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 +445,19 @@
 // TODO(turnidge): Should this be removed from the public api?
 
 /**
+ * Gets the main Dart_Port for the current isolate.
+ */
+DART_EXPORT Dart_Port Dart_GetMainPort();
+
+/**
+ * Does the current isolate have live ReceivePorts?
+ *
+ * A port is live when it has not been closed and when
+ * ReceivePort.receive() has been called to install a receive handler.
+ */
+DART_EXPORT bool Dart_HasLivePorts();
+
+/**
  * Posts a message for some isolate. The message is built from a raw
  * array.
  *
@@ -473,6 +486,16 @@
  */
 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);

[siva, 2011/11/24 00:52:31]

If I call this function multiple times with the same port id I will be getting
multiple SendPort objects back. I am not sure if that is correct.

Maybe this should be called Dart_GetSendPort(Dart_Port port);

[turnidge, 2011/11/29 01:01:31]

Discussed offline, multiple SendPorts will work.

On 2011/11/24 00:52:31, asiva wrote:

+
+/**
+ * Returns a new ReceivePort with the provided id.
+ */
+DART_EXPORT Dart_Handle Dart_NewReceivePort(Dart_Port port);

[siva, 2011/11/24 00:52:31]

Ditto comment on multiple receive ports.

[turnidge, 2011/11/29 01:01:31]

Multiple ReceivePorts don't work.  Added a comment for now.

On 2011/11/24 00:52:31, asiva wrote:

+
 // --- Scopes ----
 
 /**