Turn the VM's dart:typed_data into a patch

tools/patch_sdk.dart

 #!/usr/bin/env dart
 // Copyright (c) 2015, 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.
 
 /// Command line tool to merge the SDK libraries and our patch files.
 /// This is currently designed as an offline tool, but we could automate it.
 
 import 'dart:io';
 import 'dart:math' as math;
@@ skipping 92 matching lines @@
   for (SdkLibrary library in sdkLibraries) {
     // TODO(jmesserly): analyzer does not handle the default case of
     // "both platforms" correctly, and treats it as being supported on neither.
     // So instead we skip explicitly marked as either VM or dart2js libs.
     if (mode == 'ddc' ? libary.isVmLibrary : library.isDart2JsLibrary) {
       continue;
     }
 
     var libraryOut = path.join(sdkLibIn, library.path);
     var libraryIn;
-    if (mode == 'vm' && library.path.contains('typed_data.dart')) {
-      // dart:typed_data is unlike the other libraries in the SDK. The VM does
-      // not apply a patch to the base SDK implementation of the library.
-      // Instead, the VM provides a replacement implementation and ignores the
-      // sources in the SDK.
-      libraryIn =
-          path.join(dartDir, 'runtime', 'lib', 'typed_data.dart');
-    } else if (mode == 'ddc' && library.path.contains(INTERNAL_PATH)) {
+    if (mode == 'ddc' && library.path.contains(INTERNAL_PATH)) {
       libraryIn =
           path.join(privateIn, library.path.replaceAll(INTERNAL_PATH, ''));
     } else {
       libraryIn = libraryOut;
     }
 
     var libraryFile = new File(libraryIn);
     if (libraryFile.existsSync()) {
       var outPaths = <String>[libraryOut];
       var libraryContents = libraryFile.readAsStringSync();
@@ skipping 396 matching lines @@
     if (diff != 0) return diff;
     return end - other.end;
   }
 }
 
 List<SdkLibrary> _getSdkLibraries(String contents) {
   var libraryBuilder = new SdkLibrariesReader_LibraryBuilder(true);
   parseCompilationUnit(contents).accept(libraryBuilder);
   return libraryBuilder.librariesMap.sdkLibraries;
 }