Implement spawnUri from dart:isolate. This function allows us to

runtime/vm/object.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 VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1684 matching lines @@
 };
 
 
 class Library : public Object {
  public:
   RawString* name() const { return raw_ptr()->name_; }
   void SetName(const String& name) const;
 
   RawString* url() const { return raw_ptr()->url_; }
   RawString* private_key() const { return raw_ptr()->private_key_; }
-  RawArray* import_map() const { return raw_ptr()->import_map_; }
-  void set_import_map(const Array& map) const;
   bool LoadNotStarted() const {
     return raw_ptr()->load_state_ == RawLibrary::kAllocated;
   }
   bool LoadInProgress() const {
     return raw_ptr()->load_state_ == RawLibrary::kLoadInProgress;
   }
   void SetLoadInProgress() const;
   bool Loaded() const { return raw_ptr()->load_state_ == RawLibrary::kLoaded; }
   void SetLoaded() const;
   bool LoadError() const {
@@ skipping 18 matching lines @@
   RawField* LookupLocalField(const String& name) const;
   RawFunction* LookupFunctionAllowPrivate(const String& name) const;
   RawFunction* LookupLocalFunction(const String& name) const;
   RawLibraryPrefix* LookupLocalLibraryPrefix(const String& name) const;
   RawScript* LookupScript(const String& url) const;
   RawArray* LoadedScripts() const;
 
   void AddAnonymousClass(const Class& cls) const;
 
   // Library imports.
-  RawString* LookupImportMap(const String& name) const;
   void AddImport(const Library& library) const;
   RawLibrary* LookupImport(const String& url) const;
 
   RawFunction* LookupFunctionInSource(const String& script_url,
                                       intptr_t line_number) const;
   RawFunction* LookupFunctionInScript(const Script& script,
                                       intptr_t token_index) const;
 
   // Resolving native methods for script loaded in the library.
   Dart_NativeEntryResolver native_entry_resolver() const {
@@ skipping 3135 matching lines @@
 }
 
 
 intptr_t Stackmap::SizeInBits() const {
   return (Smi::Value(raw_ptr()->bitmap_size_in_bytes_) * kBitsPerByte);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_