Handle file URIs during coverage collection (#1210)

Closes #1214

Author: grouma

pkgs/test/CHANGELOG.md

@@ -1,6 +1,8 @@
 ## 1.14.3-dev
 
 * Fix an issue where coverage tests could not run in Chrome headless. 
+* Fix an issue where coverage collection would not work with source
+ maps that contained absolute file URIs.
 
 ## 1.14.2
 

pkgs/test/lib/src/runner/browser/chrome.dart

@@ -119,13 +119,16 @@ class Chrome extends Browser {
  Future<Uri> _sourceUriProvider(String sourceUrl, String scriptId) async {
  var script = _idToUrl[scriptId];
  if (script == null) return null;
+ var sourceUri = Uri.parse(sourceUrl);
+ if (sourceUri.scheme == 'file') return sourceUri;
+ // If the provided sourceUrl is relative, determine the package path.
  var uri = Uri.parse(script);
  var path = p.join(
  p.joinAll(uri.pathSegments.sublist(1, uri.pathSegments.length - 1)),
  sourceUrl);
  return path.contains('/packages/')
  ? Uri(scheme: 'package', path: path.split('/packages/').last)
- : Uri.file(p.absolute(path));
+ : null;
  }
 
  Future<String> _sourceMapProvider(String scriptId) async {