Roll Observatory packages and add a roll script

html/lib/parser_console.dart

-/// This library adds `dart:io` support to the HTML5 parser. Call
-/// [initDartIOSupport] before calling the [parse] methods and they will accept
-/// a [RandomAccessFile] as input, in addition to the other input types.
-library parser_console;
-
-import 'dart:io';
-import 'parser.dart';
-import 'src/inputstream.dart' as inputstream;
-
-/// Adds support to the [HtmlParser] for running on a console VM. In particular
-/// this means it will be able to handle `dart:io` and [RandomAccessFile]s as
-/// input to the various [parse] methods.
-void useConsole() {
-  inputstream.consoleSupport = new _ConsoleSupport();
-}
-
-class _ConsoleSupport extends inputstream.ConsoleSupport {
-  List<int> bytesFromFile(source) {
-    if (source is! RandomAccessFile) return null;
-    return readAllBytesFromFile(source);
-  }
-}
-
-// TODO(jmesserly): this should be `RandomAccessFile.readAllBytes`.
-/// Synchronously reads all bytes from the [file].
-List<int> readAllBytesFromFile(RandomAccessFile file) {
-  int length = file.lengthSync();
-  var bytes = new List<int>(length);
-
-  int bytesRead = 0;
-  while (bytesRead < length) {
-    int read = file.readIntoSync(bytes, bytesRead, length - bytesRead);
-    if (read <= 0) {
-      // This could happen if, for example, the file was resized while
-      // we're reading. Just shrink the bytes array and move on.
-      bytes = bytes.sublist(0, bytesRead);
-      break;
-    }
-    bytesRead += read;
-  }
-  return bytes;
-}