Description redacted.

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diff --git a/src/main/java/com/google/devtools/build/lib/packages/DelegatingAttributeMapper.java b/src/main/java/com/google/devtools/build/lib/packages/DelegatingAttributeMapper.java
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index 0000000000..b8a77baf9a
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/packages/DelegatingAttributeMapper.java
@@ -0,0 +1,99 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.build.lib.packages;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableList;
+import com.google.devtools.build.lib.syntax.Label;
+
+import javax.annotation.Nullable;
+
+/**
+ * An {@link AttributeMap} that delegates all behavior to another {@link AttributeMap}. Useful
+ * for custom mappers that just want to override specific scenarios.
+ */
+public class DelegatingAttributeMapper implements AttributeMap {
+  private final AttributeMap delegate;
+
+  public DelegatingAttributeMapper(AttributeMap delegate) {
+    this.delegate = Preconditions.checkNotNull(delegate);
+  }
+
+  @Override
+  public String getName() {
+    return delegate.getName();
+  }
+
+  @Override
+  public Label getLabel() {
+    return delegate.getLabel();
+  }
+
+  @Override
+  public <T> T get(String attributeName, Type<T> type) {
+    return delegate.get(attributeName, type);
+  }
+
+  @Override
+  public Iterable<String> getAttributeNames() {
+    return delegate.getAttributeNames();
+  }
+
+  @Nullable
+  @Override
+  public Type<?> getAttributeType(String attrName) {
+    return delegate.getAttributeType(attrName);
+  }
+
+  @Nullable
+  @Override
+  public Attribute getAttributeDefinition(String attrName) {
+    return delegate.getAttributeDefinition(attrName);
+  }
+
+  @Override
+  public boolean isAttributeValueExplicitlySpecified(String attributeName) {
+    return delegate.isAttributeValueExplicitlySpecified(attributeName);
+  }
+
+  @Override
+  public void visitLabels(AcceptsLabelAttribute observer) {
+    delegate.visitLabels(observer);
+  }
+
+  @Override
+  public String getPackageDefaultHdrsCheck() {
+    return delegate.getPackageDefaultHdrsCheck();
+  }
+
+  @Override
+  public Boolean getPackageDefaultTestOnly() {
+    return delegate.getPackageDefaultTestOnly();
+  }
+
+  @Override
+  public String getPackageDefaultDeprecation() {
+    return delegate.getPackageDefaultDeprecation();
+  }
+
+  @Override
+  public ImmutableList<String> getPackageDefaultCopts() {
+    return delegate.getPackageDefaultCopts();
+  }
+
+  @Override
+  public boolean has(String attrName, Type<?> type) {
+    return delegate.has(attrName, type);
+  }
+}