Reload native extensions when starting from a snapshot.

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 105bb66a4b7db4d7fef8912b3bc94a2636c012d5..df90d76ac3a1dfa146d27a82399e5e1ebf66b61b 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -2940,6 +2940,19 @@ DART_EXPORT Dart_Handle Dart_LibraryImportLibrary(Dart_Handle library,
                                                   Dart_Handle import,
                                                   Dart_Handle prefix);
 
+
+/**
+ * Returns a list where each element 2n is an importing library and each element

[Cutch, 2016/11/07 22:24:16]

How about:

Returns a flattened list of pairs. The first element in each pair is the
importing library and the second element in each pair is the imported
library....

[rmacnak, 2016/11/08 00:17:32]

Done.

+ * 2n+1 is an imported library for each import in the isolate of a library whose
+ * URI's scheme is [scheme].
+ *
+ * Requires there to be a current isolate.
+ *
+ * \return A handle to a list of flattened pairs of importer-importee.
+ */
+DART_EXPORT Dart_Handle Dart_GetImportsOfScheme(Dart_Handle scheme);
+
+
 /**
  * Called by the embedder to provide the source for a "part of"
  * directive.  This function should be called in response to a