Add ArrayDataTraits<> specialization for Array_Data<T>*.

mojo/public/cpp/bindings/lib/array_internal.h

 // Copyright 2013 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.
 
 #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_INTERNAL_H_
 #define MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_INTERNAL_H_
 
 #include <new>
 #include <vector>
 
@@ skipping 36 matching lines @@
     return sizeof(StorageType) * num_elements;
   }
   static Ref ToRef(StorageType* storage, size_t offset) {
     return storage[offset].ptr;
   }
   static ConstRef ToConstRef(const StorageType* storage, size_t offset) {
     return storage[offset].ptr;
   }
 };
 
+template <typename T>
+struct ArrayDataTraits<Array_Data<T>*> {
+  typedef ArrayPointer<T> StorageType;
+  typedef Array_Data<T>*& Ref;
+  typedef Array_Data<T>* const& ConstRef;
+
+  static size_t GetStorageSize(size_t num_elements) {
+    return sizeof(StorageType) * num_elements;
+  }
+  static Ref ToRef(StorageType* storage, size_t offset) {
+    return storage[offset].ptr;
+  }
+  static ConstRef ToConstRef(const StorageType* storage, size_t offset) {
+    return storage[offset].ptr;
+  }
+};
+
 // Specialization of Arrays for bools, optimized for space. It has the
 // following differences from a generalized Array:
 // * Each element takes up a single bit of memory.
 // * Accessing a non-const single element uses a helper class |BitRef|, which
 // emulates a reference to a bool.
 template <>
 struct ArrayDataTraits<bool> {
   // Helper class to emulate a reference to a bool, used for direct element
   // access.
   class BitRef {
@@ skipping 291 matching lines @@
 };
 
 template <> struct WrapperTraits<String, false> {
   typedef String_Data* DataType;
 };
 
 }  // namespace internal
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_ARRAY_INTERNAL_H_