Add ChromeCodingConvention.java to Closure Compiler to preserve getInstance() type

third_party/closure_compiler/runner/src/org/chromium/closure/compiler/ChromeCodingConvention.java

Index: third_party/closure_compiler/runner/src/org/chromium/closure/compiler/ChromeCodingConvention.java
diff --git a/third_party/closure_compiler/runner/src/org/chromium/closure/compiler/ChromeCodingConvention.java b/third_party/closure_compiler/runner/src/org/chromium/closure/compiler/ChromeCodingConvention.java
new file mode 100644
index 0000000000000000000000000000000000000000..b85f1ff6f829567ee1fa9311ebe71bfc4d02254b
--- /dev/null
+++ b/third_party/closure_compiler/runner/src/org/chromium/closure/compiler/ChromeCodingConvention.java
@@ -0,0 +1,63 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.closure.compiler;
+
+import com.google.javascript.jscomp.CodingConvention;
+import com.google.javascript.jscomp.CodingConventions;
+import com.google.javascript.jscomp.DiagnosticType;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Sets;
+import com.google.javascript.rhino.Node;
+import com.google.javascript.rhino.jstype.FunctionType;
+import com.google.javascript.rhino.jstype.ObjectType;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Set;
+
+public class ChromeCodingConvention extends CodingConventions.Proxy {
+
+  private final Set<String> indirectlyDeclaredProperties;
+
+  public ChromeCodingConvention() {
+    this(CodingConventions.getDefault());
+  }
+
+  public ChromeCodingConvention(CodingConvention wrapped) {
+    super(wrapped);
+
+    Set<String> props = Sets.newHashSet("instance_", "getInstance");
+    props.addAll(wrapped.getIndirectlyDeclaredProperties());
+    indirectlyDeclaredProperties = ImmutableSet.copyOf(props);
+  }
+
+  @Override
+  public String getSingletonGetterClassName(Node callNode) {
+    Node callArg = callNode.getFirstChild();
+
+    if (!(callArg.matchesQualifiedName("cr.addSingletonGetter")) ||
+        callNode.getChildCount() != 2) {
+      return super.getSingletonGetterClassName(callNode);
+    }
+
+    return callArg.getNext().getQualifiedName();
+  }
+
+  @Override
+  public void applySingletonGetter(FunctionType functionType,
+      FunctionType getterType, ObjectType objectType) {
+    super.applySingletonGetter(functionType, getterType, objectType);
+    functionType.defineDeclaredProperty("getInstance", getterType,
+        functionType.getSource());
+    functionType.defineDeclaredProperty("instance_", objectType,
+        functionType.getSource());
+  }
+
+  @Override
+  public Collection<String> getIndirectlyDeclaredProperties() {
+    return indirectlyDeclaredProperties;
+  }
+
+}