Add LibraryMirror.declarations and ClassMirror.declarations to the API and both implementations.

sdk/lib/_internal/lib/js_mirrors.dart

Index: sdk/lib/_internal/lib/js_mirrors.dart
diff --git a/sdk/lib/_internal/lib/js_mirrors.dart b/sdk/lib/_internal/lib/js_mirrors.dart
index f6a438a6e42b65c6ebd1d5ffbf17afa2af287c44..0fadcede74fa9d7af9dfc175cd64610c54845081 100644
--- a/sdk/lib/_internal/lib/js_mirrors.dart
+++ b/sdk/lib/_internal/lib/js_mirrors.dart
@@ -253,6 +253,7 @@ class JsLibraryMirror extends JsDeclarationMirror with JsObjectMirror
   UnmodifiableMapView<Symbol, MethodMirror> _cachedSetters;
   UnmodifiableMapView<Symbol, VariableMirror> _cachedVariables;
   UnmodifiableMapView<Symbol, Mirror> _cachedMembers;
+  UnmodifiableMapView<Symbol, DeclarationMirror> _cachedDeclarations;
   UnmodifiableListView<InstanceMirror> _cachedMetadata;
 
   JsLibraryMirror(Symbol simpleName,
@@ -430,6 +431,17 @@ class JsLibraryMirror extends JsDeclarationMirror with JsObjectMirror
     return _cachedMembers = new UnmodifiableMapView<Symbol, Mirror>(result);
   }
 
+  Map<Symbol, DeclarationMirror> get declarations {
+    if (_cachedDeclarations != null) return _cachedDeclarations;
+    var result = new Map<Symbol, DeclarationMirror>();
+    addToResult(Symbol key, Mirror value) {
+      result[key] = value;
+    }
+    members.forEach(addToResult);
+    return _cachedDeclarations =
+        new UnmodifiableMapView<Symbol, DeclarationMirror>(result);
+  }
+
   List<InstanceMirror> get metadata {
     if (_cachedMetadata != null) return _cachedMetadata;
     preserveMetadata();
@@ -1063,6 +1075,7 @@ class JsClassMirror extends JsTypeMirror with JsObjectMirror
   UnmodifiableMapView<Symbol, MethodMirror> _cachedSetters;
   UnmodifiableMapView<Symbol, VariableMirror> _cachedVariables;
   UnmodifiableMapView<Symbol, Mirror> _cachedMembers;
+  UnmodifiableMapView<Symbol, DeclarationMirror> _cachedDeclarations;
   UnmodifiableListView<InstanceMirror> _cachedMetadata;
   UnmodifiableListView<ClassMirror> _cachedSuperinterfaces;
   UnmodifiableListView<TypeVariableMirror> _cachedTypeVariables;
@@ -1226,6 +1239,19 @@ class JsClassMirror extends JsTypeMirror with JsObjectMirror
     return _cachedMembers = new UnmodifiableMapView<Symbol, Mirror>(result);
   }
 
+  Map<Symbol, DeclarationMirror> get declarations {
+    if (_cachedDeclarations != null) return _cachedDeclarations;
+    var result = new Map<Symbol, DeclarationMirror>();
+    addToResult(Symbol key, Mirror value) {
+      result[key] = value;
+    }
+    members.forEach(addToResult);
+    constructors.forEach(addToResult);
+    typeVariables.forEach((tv) => result[tv.simpleName] = tv);
+    return _cachedDeclarations =
+        new UnmodifiableMapView<Symbol, DeclarationMirror>(result);
+  }
+
   InstanceMirror setField(Symbol fieldName, Object arg) {
     JsVariableMirror mirror = variables[fieldName];
     if (mirror != null && mirror.isStatic && !mirror.isFinal) {