Add native extensions to the Dart shell, on the linux platform.

runtime/bin/dartutils.cc

 // 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.
 
 #include "bin/dartutils.h"
 
 #include "bin/file.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/globals.h"
 
 const char* DartUtils::kDartScheme = "dart:";
+const char* DartUtils::kDartExtensionScheme = "dart-ext:";
 const char* DartUtils::kBuiltinLibURL = "dart:builtin";
 const char* DartUtils::kCoreLibURL = "dart:core";
 const char* DartUtils::kCoreImplLibURL = "dart:coreimpl";
 const char* DartUtils::kIOLibURL = "dart:io";
 const char* DartUtils::kJsonLibURL = "dart:json";
 const char* DartUtils::kUriLibURL = "dart:uri";
 const char* DartUtils::kUtf8LibURL = "dart:utf8";
 
 
 const char* DartUtils::kIdFieldName = "_id";
@@ skipping 74 matching lines @@
 
 
 bool DartUtils::IsDartSchemeURL(const char* url_name) {
   static const intptr_t kDartSchemeLen = strlen(kDartScheme);
   // If the URL starts with "dart:" then it is considered as a special
   // library URL which is handled differently from other URLs.
   return (strncmp(url_name, kDartScheme, kDartSchemeLen) == 0);
 }
 
 
+bool DartUtils::IsDartExtensionSchemeURL(const char* url_name) {
+  static const intptr_t kDartExtensionSchemeLen = strlen(kDartExtensionScheme);
+  // If the URL starts with "dartext:" then it is considered as a special
+  // extension library URL which is handled differently from other URLs.
+  return
+      (strncmp(url_name, kDartExtensionScheme, kDartExtensionSchemeLen) == 0);
+}
+
+
 bool DartUtils::IsDartIOLibURL(const char* url_name) {
   return (strcmp(url_name, kIOLibURL) == 0);
 }
 
 
 bool DartUtils::IsDartJsonLibURL(const char* url_name) {
   return (strcmp(url_name, kJsonLibURL) == 0);
 }
 
 
@@ skipping 244 matching lines @@
   return cobject;
 }
 
 
 Dart_CObject* CObject::NewByteArray(int length) {
   Dart_CObject* cobject = New(Dart_CObject::kByteArray, length);
   cobject->value.as_byte_array.length = length;
   cobject->value.as_byte_array.values = reinterpret_cast<uint8_t*>(cobject + 1);
   return cobject;
 }