Issue 5157. Introduce TypeQuality. Try to find member in subclasses.

compiler/java/com/google/dart/compiler/type/DynamicTypeImplementation.java

Index: compiler/java/com/google/dart/compiler/type/DynamicTypeImplementation.java
diff --git a/compiler/java/com/google/dart/compiler/type/DynamicTypeImplementation.java b/compiler/java/com/google/dart/compiler/type/DynamicTypeImplementation.java
index 57b024eb668fa3c2fffc589d546c23523fb13314..7467104a0885130161a7c7ea9922ddca762666f6 100644
--- a/compiler/java/com/google/dart/compiler/type/DynamicTypeImplementation.java
+++ b/compiler/java/com/google/dart/compiler/type/DynamicTypeImplementation.java
@@ -4,6 +4,7 @@
 
 package com.google.dart.compiler.type;
 
+import com.google.dart.compiler.resolver.ClassElement;
 import com.google.dart.compiler.resolver.DynamicElement;
 import com.google.dart.compiler.resolver.Element;
 import com.google.dart.compiler.resolver.Elements;
@@ -133,4 +134,17 @@ class DynamicTypeImplementation extends AbstractType implements DynamicType {
   public Map<String, Type> getNamedParameterTypes() {
     return null;
   }
+  
+  @Override
+  public void registerSubClass(ClassElement subClass) {
+  }
+  
+  @Override
+  public void unregisterSubClass(ClassElement subClass) {
+  }
+
+  @Override
+  public Member lookupSubTypeMember(String name) {
+    return null;
+  }
 }