Allow multiple dart <script> tags in .sky files

sky/engine/core/app/AbstractModule.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sky/engine/config.h"
 #include "sky/engine/core/app/AbstractModule.h"
 
 #include "sky/engine/core/app/Module.h"
 
 namespace blink {
 
 AbstractModule::AbstractModule(ExecutionContext* context,
                                PassRefPtr<Document> document,
                                const String& url)
   : ContextLifecycleObserver(context),
     document_(document),
     url_(url) {
   document_->setModule(this);
 }
 
 AbstractModule::~AbstractModule() {
   document_->setModule(nullptr);
 }
 
+void AbstractModule::AddLibrary(RefPtr<DartValue> library,
+                                TextPosition position) {
+  libraries_.append(LibraryEntry(library, position));
+}
+
+String AbstractModule::UrlForLibraryAt(TextPosition position) {
+  // TODO(eseidel): This could produce invalid urls?
+  // TODO(abarth): Mangle these library names to they're not predictable.
+  // Otherwise you could 'import url.sky' in dart and it could magically work!
+  int line = position.m_line.zeroBasedInt();
+  int column = position.m_column.zeroBasedInt();
+  return url() + String::format("#l%d,c%d", line, column);
+}
+
 ExecutionContext* AbstractModule::executionContext() const {
   return ContextLifecycleObserver::executionContext();
 }
 
 } // namespace blink