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diff --git a/include/clang/Frontend/PCHContainerOperations.h b/include/clang/Frontend/PCHContainerOperations.h
new file mode 100644
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+++ b/include/clang/Frontend/PCHContainerOperations.h
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+//===--- Frontend/PCHContainerOperations.h - PCH Containers -----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_PCH_CONTAINER_OPERATIONS_H
+#define LLVM_CLANG_PCH_CONTAINER_OPERATIONS_H
+
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include <memory>
+
+namespace llvm {
+class raw_pwrite_stream;
+class BitstreamReader;
+}
+
+namespace clang {
+
+class ASTConsumer;
+class CodeGenOptions;
+class DiagnosticsEngine;
+class HeaderSearchOptions;
+class LangOptions;
+class PreprocessorOptions;
+class TargetOptions;
+
+struct PCHBuffer {
+  bool IsComplete;
+  llvm::SmallVector<char, 0> Data;
+};
+
+/// \brief This abstract interface provides operations for creating
+/// and unwrapping containers for serialized ASTs (precompiled headers
+/// and clang modules).
+class PCHContainerOperations {
+public:
+  virtual ~PCHContainerOperations();
+  /// \brief Return an ASTConsumer that can be chained with a
+  /// PCHGenerator that produces a wrapper file format containing a
+  /// serialized AST bitstream.
+  virtual std::unique_ptr<ASTConsumer> CreatePCHContainerGenerator(
+      DiagnosticsEngine &Diags, const HeaderSearchOptions &HSO,
+      const PreprocessorOptions &PPO, const TargetOptions &TO,
+      const LangOptions &LO, const std::string &MainFileName,
+      const std::string &OutputFileName, llvm::raw_pwrite_stream *OS,
+      std::shared_ptr<PCHBuffer> Buffer) const = 0;
+
+  /// \brief Initialize an llvm::BitstreamReader with the serialized AST inside
+  /// the PCH container Buffer.
+  virtual void ExtractPCH(llvm::MemoryBufferRef Buffer,
+                          llvm::BitstreamReader &StreamFile) const = 0;
+};
+
+/// \brief Implements a raw pass-through PCH container.
+class RawPCHContainerOperations : public PCHContainerOperations {
+  /// \brief Return an ASTConsumer that can be chained with a
+  /// PCHGenerator that writes the module to a flat file.
+  std::unique_ptr<ASTConsumer> CreatePCHContainerGenerator(
+      DiagnosticsEngine &Diags, const HeaderSearchOptions &HSO,
+      const PreprocessorOptions &PPO, const TargetOptions &TO,
+      const LangOptions &LO, const std::string &MainFileName,
+      const std::string &OutputFileName, llvm::raw_pwrite_stream *OS,
+      std::shared_ptr<PCHBuffer> Buffer) const override;
+
+  /// \brief Initialize an llvm::BitstreamReader with Buffer.
+  void ExtractPCH(llvm::MemoryBufferRef Buffer,
+                  llvm::BitstreamReader &StreamFile) const override;
+};
+}
+
+#endif