Revert r43217, r43215, r43208, r43207, and r43202.

runtime/include/dart_api.h

Index: runtime/include/dart_api.h
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index d799fc030d6a0187615dfc7a1c36611c2066353e..a22449db6f266ba0168820119c811e06982f9ed6 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -737,6 +737,34 @@ typedef Dart_Isolate (*Dart_IsolateCreateCallback)(const char* script_uri,
                                                    void* callback_data,
                                                    char** error);
 
+
+/**
+ * The service isolate creation and initialization callback function.
+ *
+ * This callback, provided by the embedder, is called when the vm
+ * needs to create the service isolate. The callback should create an isolate
+ * by calling Dart_CreateIsolate and prepare the isolate to be used as
+ * the service isolate.
+ *
+ * When the function returns NULL, it is the responsibility of this
+ * function to ensure that Dart_ShutdownIsolate has been called if
+ * required.
+ *
+ * When the function returns NULL, the function should set *error to
+ * a malloc-allocated buffer containing a useful error message.  The
+ * caller of this function (the vm) will make sure that the buffer is
+ * freed.
+ *
+ *
+ * \param error A structure into which the embedder can place a
+ *   C string containing an error message in the case of failures.
+ *
+ * \return The embedder returns NULL if the creation and
+ *   initialization was not successful and the isolate if successful.
+ */
+typedef Dart_Isolate (*Dart_ServiceIsolateCreateCalback)(void* callback_data,
+                                                         char** error);
+
 /**
  * An isolate interrupt callback function.
  *
@@ -845,7 +873,8 @@ DART_EXPORT bool Dart_Initialize(
     Dart_FileReadCallback file_read,
     Dart_FileWriteCallback file_write,
     Dart_FileCloseCallback file_close,
-    Dart_EntropySource entropy_source);
+    Dart_EntropySource entropy_source,
+    Dart_ServiceIsolateCreateCalback service_create);
 
 /**
  * Cleanup state in the VM before process termination.
@@ -2728,26 +2757,29 @@ DART_EXPORT Dart_Handle Dart_SetPeer(Dart_Handle object, void* peer);
  * =======
  */
 
-
-#define DART_VM_SERVICE_ISOLATE_NAME "vm-service"
-
 /**
- * Returns true if isolate is the service isolate.
+ * Returns the Service isolate initialized and with the dart:vmservice library
+ * loaded and booted.
+ *
+ * This will call the embedder provided Dart_ServiceIsolateCreateCalback to
+ * create the isolate.
+ *
+ * After obtaining the service isolate the embedder specific glue code can
+ * be loaded in and the isolate can be run by the embedder.
  *
- * \param isolate An isolate
+ * NOTE: It is not safe to call this from multiple threads concurrently.
  *
- * \return Returns true if 'isolate' is the service isolate.
+ * \return Returns NULL if an error occurred.
  */
-DART_EXPORT bool Dart_IsServiceIsolate(Dart_Isolate isolate);
+DART_EXPORT Dart_Isolate Dart_GetServiceIsolate(void* callback_data);
 
 
 /**
- * Returns the port that script load requests should be sent on.
+ * Returns true if the service is enabled. False otherwise.
  *
- * \return Returns the port for load requests or ILLEGAL_PORT if the service
- * isolate failed to startup or does not support load requests.
+ *  \return Returns true if service is running.
  */
-DART_EXPORT Dart_Port Dart_ServiceWaitForLoadPort();
+DART_EXPORT bool Dart_IsServiceRunning();
 
 
 /**