C bindings: Implement _DeepCopy() & some unittests.

mojo/public/c/bindings/array.h

 // Copyright 2016 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_C_BINDINGS_ARRAY_H_
 #define MOJO_PUBLIC_C_BINDINGS_ARRAY_H_
 
 #include <stdint.h>
 
 #include "mojo/public/c/bindings/buffer.h"
@@ skipping 96 matching lines @@
 // |inout_context|: An initialized context that contains the expected location
 //                  of the next pointer and next offset. This is used to
 //                  validate that no two pointers or handles are shared.
 MojomValidationResult MojomArray_Validate(
     const struct MojomTypeDescriptorArray* in_type_desc,
     const struct MojomArrayHeader* in_array,
     uint32_t in_array_size,
     uint32_t in_num_handles,
     struct MojomValidationContext* inout_context);
 
+// Creates a new copy of |in_array| using |buffer| to allocate space.
+// Recursively creates new copies of any references from |in_array|, and updates
+// the references to point to the new copies. This operation is useful if you
+// want to linearize |in_array| using the buffer backed by |buffer|. The new
+// copy of the array is returned, or NULL if there is insufficient space in the
+// buffer, in which case the buffer may be partially used.
+// |buffer|: A mojom buffer used to allocate space for the new array.
+// |in_type_desc|: Describes the pointer and handle fields of the mojom array.
+// |in_array|: The unencoded mojom array to be copied.
+struct MojomArrayHeader* MojomArray_DeepCopy(
+    struct MojomBuffer* buffer,
+    const struct MojomTypeDescriptorArray* in_type_desc,
+    const struct MojomArrayHeader* in_array);
+
 MOJO_END_EXTERN_C
 
 #endif  // MOJO_PUBLIC_C_BINDINGS_ARRAY_H_