Support hot reloading libraries with native extensions

runtime/vm/isolate_reload.cc

 // Copyright (c) 2016, 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.
 
 #include "vm/isolate_reload.h"
 
 #include "vm/become.h"
 #include "vm/bit_vector.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 1064 matching lines @@
     {
       // Reload existing libraries.
       UnorderedHashMap<LibraryMapTraits>::Iterator it(&lib_map);
 
       while (it.MoveNext()) {
         const intptr_t entry = it.Current();
         ASSERT(entry != -1);
         new_lib = Library::RawCast(lib_map.GetKey(entry));
         lib = Library::RawCast(lib_map.GetPayload(entry, 0));
         new_lib.set_debuggable(lib.IsDebuggable());
+        // Native extension support.
+        new_lib.set_native_entry_resolver(lib.native_entry_resolver());
+        new_lib.set_native_entry_symbol_resolver(
+            lib.native_entry_symbol_resolver());
       }
     }
 
     // Release the library map.
     lib_map.Release();
   }
 
   {
     TIMELINE_SCOPE(UpdateLibrariesArray);
     // Update the libraries array.
@@ skipping 582 matching lines @@
         ASSERT(!super_cls.IsNull());
         super_cls.AddDirectSubclass(cls);
       }
     }
   }
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart