Access to imports in the VM's runtime mirrors. Extend test coverage of the source mirrors.

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index 8512cd32f7803774cc7f86a0782fd616c1d33c37..43a5e396471f0e438975215ce59fa36c82367970 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -4939,7 +4939,7 @@ void Parser::ParseIdentList(GrowableObjectArray* names) {
 }
 
 
-void Parser::ParseLibraryImportExport() {
+void Parser::ParseLibraryImportExport(intptr_t metadata_pos) {
   bool is_import = (CurrentToken() == Token::kIMPORT);
   bool is_export = (CurrentToken() == Token::kEXPORT);
   ASSERT(is_import || is_export);
@@ -5002,8 +5002,13 @@ void Parser::ParseLibraryImportExport() {
       library.Register();
     }
   }
-  const Namespace& ns =
-    Namespace::Handle(Namespace::New(library, show_names, hide_names));
+
+  Namespace& ns =
+      Namespace::Handle(Namespace::New(library, show_names, hide_names));
+  if (metadata_pos >= 0) {
+    ns.AddMetadata(metadata_pos, current_class());
+  }
+
   if (is_import) {
     // Ensure that private dart:_ libraries are only imported into dart:
     // libraries.
@@ -5076,7 +5081,7 @@ void Parser::ParseLibraryDefinition() {
   }
   while ((CurrentToken() == Token::kIMPORT) ||
       (CurrentToken() == Token::kEXPORT)) {
-    ParseLibraryImportExport();
+    ParseLibraryImportExport(metadata_pos);
     rewind_pos = TokenPos();
     metadata_pos = SkipMetadata();
   }