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diff --git a/mojo/public/cpp/bindings/lib/serialization_context.h b/mojo/public/cpp/bindings/lib/serialization_context.h
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+++ b/mojo/public/cpp/bindings/lib/serialization_context.h
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+// 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_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_CONTEXT_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_CONTEXT_H_
+
+#include <stddef.h>
+
+#include <memory>
+#include <queue>
+#include <vector>
+
+#include "base/macros.h"
+#include "mojo/public/cpp/bindings/bindings_export.h"
+#include "mojo/public/cpp/bindings/lib/bindings_internal.h"
+#include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
+#include "mojo/public/cpp/system/handle.h"
+
+namespace mojo {
+namespace internal {
+
+// A container for handles during serialization/deserialization.
+class MOJO_CPP_BINDINGS_EXPORT SerializedHandleVector {
+ public:
+  SerializedHandleVector();
+  ~SerializedHandleVector();
+
+  size_t size() const { return handles_.size(); }
+
+  // Adds a handle to the handle list and returns its index for encoding.
+  Handle_Data AddHandle(mojo::Handle handle);
+
+  // Takes a handle from the list of serialized handle data.
+  mojo::Handle TakeHandle(const Handle_Data& encoded_handle);
+
+  // Takes a handle from the list of serialized handle data and returns it in
+  // |*out_handle| as a specific scoped handle type.
+  template <typename T>
+  ScopedHandleBase<T> TakeHandleAs(const Handle_Data& encoded_handle) {
+    return MakeScopedHandle(T(TakeHandle(encoded_handle).value()));
+  }
+
+  // Swaps all owned handles out with another Handle vector.
+  void Swap(std::vector<mojo::Handle>* other);
+
+ private:
+  // Handles are owned by this object.
+  std::vector<mojo::Handle> handles_;
+
+  DISALLOW_COPY_AND_ASSIGN(SerializedHandleVector);
+};
+
+// Context information for serialization/deserialization routines.
+struct MOJO_CPP_BINDINGS_EXPORT SerializationContext {
+  SerializationContext();
+
+  ~SerializationContext();
+
+  // Opaque context pointers returned by StringTraits::SetUpContext().
+  std::unique_ptr<std::queue<void*>> custom_contexts;
+
+  // Stashes handles encoded in a message by index.
+  SerializedHandleVector handles;
+
+  // The number of ScopedInterfaceEndpointHandles that need to be serialized.
+  // It is calculated by PrepareToSerialize().
+  uint32_t associated_endpoint_count = 0;
+
+  // Stashes ScopedInterfaceEndpointHandles encoded in a message by index.
+  std::vector<ScopedInterfaceEndpointHandle> associated_endpoint_handles;
+};
+
+}  // namespace internal
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_LIB_BINDINGS_SERIALIZATION_CONTEXT_H_