Add Dart_CurrentIsolateData().

runtime/include/dart_api.h

 // Copyright (c) 2012, 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.
 
 #ifndef INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
  *
  * Dart is a class-based programming language for creating structured
@@ skipping 692 matching lines @@
 DART_EXPORT void Dart_ShutdownIsolate();
 // TODO(turnidge): Document behavior when there is no current isolate.
 
 /**
  * Returns the current isolate. Will return NULL if there is no
  * current isolate.
  */
 DART_EXPORT Dart_Isolate Dart_CurrentIsolate();
 
 /**
+ * Returns the callback data which was passed to the isolate when it
+ * was created.
+ */
+DART_EXPORT void* Dart_CurrentIsolateData();
+
+/**
  * Returns the debugging name for the current isolate.
  *
  * This name is unique to each isolate and should only be used to make
  * debugging messages more comprehensible.
  */
 DART_EXPORT Dart_Handle Dart_DebugName();
 
 /**
  * Enters an isolate. After calling this function,
  * the current isolate will be set to the provided isolate.
@@ skipping 1663 matching lines @@
 // information that can be used for better profile reports for
 // dynamically generated code.
 DART_EXPORT void Dart_InitPprofSupport();
 DART_EXPORT void Dart_GetPprofSymbolInfo(void** buffer, int* buffer_size);
 
 // Support for generating flow graph compiler debugging output into a file.
 typedef void (*FileWriterFunction)(const char* buffer, int64_t num_bytes);
 DART_EXPORT void Dart_InitFlowGraphPrinting(FileWriterFunction function);
 
 #endif  // INCLUDE_DART_API_H_