Introduce heap snapshot into Memory Dashboard

runtime/observatory/lib/src/models/repositories/editor.dart

Index: runtime/observatory/lib/src/models/repositories/editor.dart
diff --git a/runtime/observatory/lib/src/models/repositories/editor.dart b/runtime/observatory/lib/src/models/repositories/editor.dart
index 6d6011a995af6f545acabed787ff47aa98de29e0..aef71996f5afdf839410468e6b776764bbb939f4 100644
--- a/runtime/observatory/lib/src/models/repositories/editor.dart
+++ b/runtime/observatory/lib/src/models/repositories/editor.dart
@@ -5,8 +5,11 @@
 part of models;
 
 abstract class EditorRepository {
-  bool get canOpenClass;
+  bool get isAvailable;
 
   Future openClass(IsolateRef isolate, ClassRef clazz);
+  Future openField(IsolateRef isolate, FieldRef clazz);
+  Future openFunction(IsolateRef isolate, FunctionRef clazz);
+  Future openObject(IsolateRef isolate, ObjectRef clazz);
   Future openSourceLocation(IsolateRef isolate, SourceLocation location);
 }