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

runtime/lib/mirrors_impl.dart

Index: runtime/lib/mirrors_impl.dart
diff --git a/runtime/lib/mirrors_impl.dart b/runtime/lib/mirrors_impl.dart
index f527df78f99fbf22317d7b165d9282c6bec723f3..f58113998955a9d4214fae9dc67b2becea968404 100644
--- a/runtime/lib/mirrors_impl.dart
+++ b/runtime/lib/mirrors_impl.dart
@@ -1297,6 +1297,17 @@ class _LocalLibraryMirror extends _LocalObjectMirror implements LibraryMirror {
     return new _InvocationTrampoline(this, selector);
   }
 
+  var _cachedLibraryDependencies;
+  get libraryDependencies {
+    if (_cachedLibraryDependencies == null) {
+      _cachedLibraryDependencies = _libraryDependencies(_reflectee);
+    }
+    return _cachedLibraryDependencies;
+  }
+
+  _libraryDependencies(reflectee)
+      native 'LibraryMirror_libraryDependencies';
+
   _invoke(reflectee, memberName, arguments, argumentNames)
       native 'LibraryMirror_invoke';
 
@@ -1310,6 +1321,37 @@ class _LocalLibraryMirror extends _LocalObjectMirror implements LibraryMirror {
       native "LibraryMirror_members";
 }
 
+class _LocalLibraryDependencyMirror
+    extends _LocalMirror implements LibraryDependencyMirror {
+  final LibraryMirror sourceLibrary;
+  final LibraryMirror targetLibrary;
+  final List<CombinatorMirror> combinators;
+  final Symbol prefix;
+  final bool isImport;
+  final List<InstanceMirror> metadata;
+
+  _LocalLibraryDependencyMirror(this.sourceLibrary,
+                                this.targetLibrary,
+                                this.combinators,
+                                prefixString,
+                                this.isImport,
+                                unwrappedMetadata)
+      : prefix = _s(prefixString),
+        metadata = new UnmodifiableListView(unwrappedMetadata.map(reflect));
+
+  bool get isExport => !isImport;
+}
+
+class _LocalCombinatorMirror extends _LocalMirror implements CombinatorMirror {
+  final List<Symbol> identifiers;
+  final bool isShow;
+
+  _LocalCombinatorMirror(identifierString, this.isShow)
+      : this.identifiers = [_s(identifierString)];
+
+  bool get isHide => !isShow;
+}
+
 class _LocalMethodMirror extends _LocalDeclarationMirror
     implements MethodMirror {
   final bool isStatic;