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diff --git a/dom/media/gmp/widevine-adapter/content_decryption_module_proxy.h b/dom/media/gmp/widevine-adapter/content_decryption_module_proxy.h
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+++ b/dom/media/gmp/widevine-adapter/content_decryption_module_proxy.h
@@ -0,0 +1,121 @@
+// Copyright 2017 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 CDM_CONTENT_DECRYPTION_MODULE_PROXY_H_
+#define CDM_CONTENT_DECRYPTION_MODULE_PROXY_H_
+
+#include "content_decryption_module_export.h"
+
+#if defined(_MSC_VER)
+typedef unsigned char uint8_t;
+typedef unsigned int uint32_t;
+typedef unsigned __int64 uint64_t;
+#else
+#  include <stdint.h>
+#endif
+
+namespace cdm {
+
+class CDM_CLASS_API CdmProxyClient;
+
+// A proxy class for the CDM.
+// In general, the interpretation of the CdmProxy and CdmProxyClient method
+// parameters are protocol dependent. For enum parameters, values outside the
+// enum range may not work.
+class CDM_CLASS_API CdmProxy {
+ public:
+  enum Function : uint32_t {
+    // For Intel Negotiate Crypto SessionKey Exchange (CSME) path to call
+    // ID3D11VideoContext::NegotiateCryptoSessionKeyExchange.
+    kIntelNegotiateCryptoSessionKeyExchange = 1,
+    // There will be more values in the future e.g. for D3D11 RSA method.
+  };
+
+  enum KeyType : uint32_t {
+    kDecryptOnly = 0,
+    kDecryptAndDecode = 1,
+  };
+
+  // Initializes the proxy. The results will be returned in
+  // CdmProxyClient::OnInitialized().
+  virtual void Initialize() = 0;
+
+  // Processes and updates the state of the proxy.
+  // |output_data_size| is required by some protocol to set up the output data.
+  // The operation may fail if the |output_data_size| is wrong. The results will
+  // be returned in CdmProxyClient::OnProcessed().
+  virtual void Process(Function function, uint32_t crypto_session_id,
+                       const uint8_t* input_data, uint32_t input_data_size,
+                       uint32_t output_data_size) = 0;
+
+  // Creates a crypto session for handling media.
+  // If extra data has to be passed to further setup the media crypto session,
+  // pass the data as |input_data|. The results will be returned in
+  // CdmProxyClient::OnMediaCryptoSessionCreated().
+  virtual void CreateMediaCryptoSession(const uint8_t* input_data,
+                                        uint32_t input_data_size) = 0;
+
+  // Sets a key for the session identified by |crypto_session_id|.
+  virtual void SetKey(uint32_t crypto_session_id, const uint8_t* key_id,
+                      uint32_t key_id_size, KeyType key_type,
+                      const uint8_t* key_blob, uint32_t key_blob_size) = 0;
+
+  // Removes a key for the session identified by |crypto_session_id|.
+  virtual void RemoveKey(uint32_t crypto_session_id, const uint8_t* key_id,
+                         uint32_t key_id_size) = 0;
+
+ protected:
+  CdmProxy() {}
+  virtual ~CdmProxy() {}
+};
+
+// Responses to CdmProxy calls. All responses will be called asynchronously.
+class CDM_CLASS_API CdmProxyClient {
+ public:
+  enum Status : uint32_t {
+    kOk,
+    kFail,
+  };
+
+  enum Protocol : uint32_t {
+    kNone = 0,  // No protocol supported. Can be used in failure cases.
+    kIntel,     // Method using Intel CSME.
+    // There will be more values in the future e.g. kD3D11RsaHardware,
+    // kD3D11RsaSoftware to use the D3D11 RSA method.
+  };
+
+  // Callback for Initialize(). If the proxy created a crypto session, then the
+  // ID for the crypto session is |crypto_session_id|.
+  virtual void OnInitialized(Status status, Protocol protocol,
+                             uint32_t crypto_session_id) = 0;
+
+  // Callback for Process(). |output_data| is the output of processing.
+  virtual void OnProcessed(Status status, const uint8_t* output_data,
+                           uint32_t output_data_size) = 0;
+
+  // Callback for CreateMediaCryptoSession(). On success:
+  // - |crypto_session_id| is the ID for the created crypto session.
+  // - |output_data| is extra value, if any.
+  // Otherwise, |crypto_session_id| and |output_data| should be ignored.
+  virtual void OnMediaCryptoSessionCreated(Status status,
+                                           uint32_t crypto_session_id,
+                                           uint64_t output_data) = 0;
+
+  // Callback for SetKey().
+  virtual void OnKeySet(Status status) = 0;
+
+  // Callback for RemoveKey().
+  virtual void OnKeyRemoved(Status status) = 0;
+
+  // Called when there is a hardware reset and all the hardware context is lost.
+  virtual void NotifyHardwareReset() = 0;
+
+ protected:
+  CdmProxyClient() {}
+  virtual ~CdmProxyClient() {}
+};
+
+}  // namespace cdm
+
+#endif  // CDM_CONTENT_DECRYPTION_MODULE_PROXY_H_