Different approach to fixing file to URI mapping.

pkg/analyzer/test/generated/all_the_rest_test.dart

Index: pkg/analyzer/test/generated/all_the_rest_test.dart
diff --git a/pkg/analyzer/test/generated/all_the_rest_test.dart b/pkg/analyzer/test/generated/all_the_rest_test.dart
index f1f6b27acc4dfb248b517ea4e3ce2859662677a6..5d74e2c67b467593548f2bf9ff495bb18cffb724 100644
--- a/pkg/analyzer/test/generated/all_the_rest_test.dart
+++ b/pkg/analyzer/test/generated/all_the_rest_test.dart
@@ -188,6 +188,19 @@ class DirectoryBasedDartSdkTest {
     expect(source.uri.toString(), "dart:html");
   }
 
+  void test_fromFile_library_html_common_dart2js() {
+    DirectoryBasedDartSdk sdk = _createDartSdk();
+    JavaFile dirHtml = new JavaFile.relative(sdk.libraryDirectory, "html");
+    JavaFile dirCommon = new JavaFile.relative(dirHtml, "html_common");
+    JavaFile file =
+        new JavaFile.relative(dirCommon, "html_common_dart2js.dart");
+    expect(file.isFile(), isTrue);
+    Source source = sdk.fromFileUri(file.toURI());
+    expect(source, isNotNull);
+    expect(source.isInSystemLibrary, isTrue);
+    expect(source.uri.toString(), "dart:html_common/html_common_dart2js.dart");
+  }
+
   void test_fromFile_part() {
     DirectoryBasedDartSdk sdk = _createDartSdk();
     Source source = sdk.fromFileUri(new JavaFile.relative(