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diff --git a/dom/media/eme/clearkey/ClearKeyDecryptionManager.h b/dom/media/eme/clearkey/ClearKeyDecryptionManager.h
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+++ b/dom/media/eme/clearkey/ClearKeyDecryptionManager.h
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+/*
+ * Copyright 2015, Mozilla Foundation and contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __ClearKeyDecryptionManager_h__
+#define __ClearKeyDecryptionManager_h__
+
+// This include is required in order for content_decryption_module to work
+// on Unix systems.
+#include <stddef.h>
+
+#include <map>
+
+#include "content_decryption_module.h"
+
+#include "ClearKeyUtils.h"
+#include "RefCounted.h"
+
+class ClearKeyDecryptor;
+
+class CryptoMetaData {
+ public:
+  CryptoMetaData() = default;
+
+  explicit CryptoMetaData(const cdm::InputBuffer_2* aInputBuffer) {
+    Init(aInputBuffer);
+  }
+
+  void Init(const cdm::InputBuffer_2* aInputBuffer) {
+    if (!aInputBuffer) {
+      assert(!IsValid());
+      return;
+    }
+
+    mEncryptionScheme = aInputBuffer->encryption_scheme;
+    Assign(mKeyId, aInputBuffer->key_id, aInputBuffer->key_id_size);
+    Assign(mIV, aInputBuffer->iv, aInputBuffer->iv_size);
+    mCryptByteBlock = aInputBuffer->pattern.crypt_byte_block;
+    mSkipByteBlock = aInputBuffer->pattern.skip_byte_block;
+
+    for (uint32_t i = 0; i < aInputBuffer->num_subsamples; ++i) {
+      const cdm::SubsampleEntry& subsample = aInputBuffer->subsamples[i];
+      mClearBytes.push_back(subsample.clear_bytes);
+      mCipherBytes.push_back(subsample.cipher_bytes);
+    }
+  }
+
+  bool IsValid() const {
+    return !mKeyId.empty() && !mIV.empty() && !mCipherBytes.empty() &&
+           !mClearBytes.empty();
+  }
+
+  size_t NumSubsamples() const {
+    assert(mClearBytes.size() == mCipherBytes.size());
+    return mClearBytes.size();
+  }
+
+  cdm::EncryptionScheme mEncryptionScheme;
+  std::vector<uint8_t> mKeyId;
+  std::vector<uint8_t> mIV;
+  uint32_t mCryptByteBlock;
+  uint32_t mSkipByteBlock;
+  std::vector<uint32_t> mClearBytes;
+  std::vector<uint32_t> mCipherBytes;
+};
+
+class ClearKeyDecryptionManager : public RefCounted {
+ private:
+  ClearKeyDecryptionManager();
+  ~ClearKeyDecryptionManager();
+
+  static ClearKeyDecryptionManager* sInstance;
+
+ public:
+  static ClearKeyDecryptionManager* Get();
+
+  bool HasSeenKeyId(const KeyId& aKeyId) const;
+  bool HasKeyForKeyId(const KeyId& aKeyId) const;
+
+  const Key& GetDecryptionKey(const KeyId& aKeyId);
+
+  // Create a decryptor for the given KeyId if one does not already exist.
+  void InitKey(KeyId aKeyId, Key aKey);
+  void ExpectKeyId(KeyId aKeyId);
+  void ReleaseKeyId(KeyId aKeyId);
+
+  // Decrypts buffer *in place*.
+  cdm::Status Decrypt(uint8_t* aBuffer, uint32_t aBufferSize,
+                      const CryptoMetaData& aMetadata);
+  cdm::Status Decrypt(std::vector<uint8_t>& aBuffer,
+                      const CryptoMetaData& aMetadata);
+
+ private:
+  bool IsExpectingKeyForKeyId(const KeyId& aKeyId) const;
+
+  std::map<KeyId, ClearKeyDecryptor*> mDecryptors;
+};
+
+#endif  // __ClearKeyDecryptionManager_h__