Roll Observatory deps (charted -> ^0.3.0)

packages/stack_trace/lib/src/utils.dart

Index: packages/stack_trace/lib/src/utils.dart
diff --git a/packages/stack_trace/lib/src/utils.dart b/packages/stack_trace/lib/src/utils.dart
index 62a282085662d84baf6db0b38e3dc669c838f4ea..1d09443c1cfb62dfb7249158d56f32424ccd2542 100644
--- a/packages/stack_trace/lib/src/utils.dart
+++ b/packages/stack_trace/lib/src/utils.dart
@@ -4,6 +4,10 @@
 
 library stack_trace.src.utils;
 
+/// The line used in the string representation of stack chains to represent
+/// the gap between traces.
+const chainGap = '===== asynchronous gap ===========================\n';
+
 /// Returns [string] with enough spaces added to the end to make it [length]
 /// characters long.
 String padRight(String string, int length) {