Roll Observatory deps (charted -> ^0.3.0)

packages/dart_style/test/whitespace/metadata.unit

 40 columns                              |
 >>> force newline before directives
 @deprecated library foo;
 
 @deprecated import 'dart:io';
 
 @deprecated export 'dart:io';
 <<<
 @deprecated
 library foo;
 
 @deprecated
 import 'dart:io';
 
 @deprecated
 export 'dart:io';
+>>> metadata on part
+@foo part "part.dart";
+<<<
+@foo
+part "part.dart";
+>>> metadata on part of
+@foo part of bar;
+<<<
+@foo
+part of bar;
 >>> force newline before types
 @meta class X {}
 
 @meta class Y = X with Z;
 
 @meta typedef void X(y);
 <<<
 @meta
 class X {}
 
@@ skipping 181 matching lines @@
 <<<
 withReturnType(
     @foo @bar int fn(@foo param)) {}
 withoutReturnType(
     @foo @bar fn(@foo param)) {}
 >>> metadata on default formal parameter
 positional([@foo bar]) {}
 named({@foo bar}) {}
 <<<
 positional([@foo bar]) {}
-named({@foo bar}) {}
+named({@foo bar}) {}
+>>> split between metadata and parameter indents
+function(@VeryLongMetadataAnnotation longParameter) {}
+<<<
+function(
+    @VeryLongMetadataAnnotation
+        longParameter) {}