Update charted to 0.4.8 and roll

packages/source_span/lib/src/file.dart

 // Copyright (c) 2014, 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.
 
-library source_span.file;
-
 import 'dart:math' as math;
 import 'dart:typed_data';
 
 import 'location.dart';
 import 'location_mixin.dart';
 import 'span.dart';
 import 'span_mixin.dart';
 import 'span_with_context.dart';
 
 // Constants to determine end-of-lines.
@@ skipping 27 matching lines @@
   int get lines => _lineStarts.length;
 
   /// The line that the offset fell on the last time [getLine] was called.
   ///
   /// In many cases, sequential calls to getLine() are for nearby, usually
   /// increasing offsets. In that case, we can find the line for an offset
   /// quickly by first checking to see if the offset is on the same line as the
   /// previous result.
   int _cachedLine;
 
+  /// This constructor is deprecated.
+  ///
+  /// Use [new SourceFile.fromString] instead.
+  @Deprecated("Will be removed in 2.0.0")
+  SourceFile(String text, {url})
+      : this.decoded(text.runes, url: url);
+
   /// Creates a new source file from [text].
   ///
   /// [url] may be either a [String], a [Uri], or `null`.
-  SourceFile(String text, {url})
-      : this.decoded(text.runes, url: url);
+  SourceFile.fromString(String text, {url})
+      : this.decoded(text.codeUnits, url: url);
 
-  /// Creates a new source file from a list of decoded characters.
+  /// Creates a new source file from a list of decoded code units.
   ///
   /// [url] may be either a [String], a [Uri], or `null`.
+  ///
+  /// Currently, if [decodedChars] contains characters larger than `0xFFFF`,
+  /// they'll be treated as single characters rather than being split into
+  /// surrogate pairs. **This behavior is deprecated**. For
+  /// forwards-compatibility, callers should only pass in characters less than
+  /// or equal to `0xFFFF`.
   SourceFile.decoded(Iterable<int> decodedChars, {url})
       : url = url is String ? Uri.parse(url) : url,
         _decodedChars = new Uint32List.fromList(decodedChars.toList()) {
     for (var i = 0; i < _decodedChars.length; i++) {
       var c = _decodedChars[i];
       if (c == _CR) {
         // Return not followed by newline is treated as a newline
         var j = i + 1;
         if (j >= _decodedChars.length || _decodedChars[j] != _LF) c = _LF;
       }
@@ skipping 276 matching lines @@
       var start = math.min(this._start, other._start);
       var end = math.max(this._end, other._end);
       return new _FileSpan(file, start, end);
     } else {
       var start = math.min(this._start, other.start.offset);
       var end = math.max(this._end, other.end.offset);
       return new _FileSpan(file, start, end);
     }
   }
 }