Roll Observatory deps (charted -> ^0.3.0)

packages/charted/lib/core/utils/bidi_formatter.dart

 //
 // Copyright 2014 Google Inc. All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 //
 
 part of charted.core.utils;
 
 /// Charts are always drawn with LTR context.
 BidiFormatter _bidiFormatter = new BidiFormatter.LTR();
 
 /// Fix direction of HTML using <span dir="..."> for RTL when required
 fixMarkupDirection(String markup) =>
-    _bidiFormatter.wrapWithSpan(markup, isHtml:true);
+    _bidiFormatter.wrapWithSpan(markup, isHtml: true);
 
 /// Fix direction of text using unicode markers for RTL when required
 /// This is a simplified version of BidiFormatter.wrapWithUnicode that
 /// is meant to be used for small labels only (Eg: axis ticks).
 String fixSimpleTextDirection(String text) {
   TextDirection direction = estimateDirectionOfSimpleText(text);
   if (TextDirection.RTL == direction) {
     var marker = direction == TextDirection.RTL ? Bidi.RLE : Bidi.LRE;
     return "${marker}$text${Bidi.PDF}";
   }
@@ skipping 20 matching lines @@
     } else if (_digitsRegExp.hasMatch(token)) {
       hasWeaklyLtr = true;
     }
   }
   if (total == 0) {
     return hasWeaklyLtr ? TextDirection.LTR : TextDirection.UNKNOWN;
   } else {
     return rtlCount > 0.4 * total ? TextDirection.RTL : TextDirection.LTR;
   }
 }