Implement "Key Presence" step in "Encrypted Block Encounted" algorithm in EME.

media/crypto/aes_decryptor_unittest.cc

 // Copyright (c) 2012 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.
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/sys_byteorder.h"
@@ skipping 328 matching lines @@
 
   AddKeyAndExpectToSucceed(frame.key_id, frame.key_id_size,
                            &wrong_key[0], frame.key_size);
   scoped_refptr<DecoderBuffer> encrypted_data =
       CreateWebMEncryptedBuffer(frame.encrypted_data,
                                 frame.encrypted_data_size,
                                 frame.key_id, frame.key_id_size);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToFail(encrypted_data));
 }
 
+TEST_F(AesDecryptorTest, NoKey) {
+  const WebmEncryptedData& frame = kWebmEncryptedFrames[0];
+  GenerateKeyRequest(frame.key_id, frame.key_id_size);
+
+  scoped_refptr<DecoderBuffer> encrypted_data =
+      CreateWebMEncryptedBuffer(frame.encrypted_data, frame.encrypted_data_size,
+                                frame.key_id, frame.key_id_size);
+  EXPECT_CALL(*this, BufferDecrypted(AesDecryptor::kNoKey, IsNull()));
+  decryptor_.Decrypt(encrypted_data, decrypt_cb_);
+}
+
 TEST_F(AesDecryptorTest, KeyReplacement) {
   const WebmEncryptedData& frame = kWebmEncryptedFrames[0];
   GenerateKeyRequest(frame.key_id, frame.key_id_size);
 
   // Change the first byte of the key.
   std::vector<uint8> wrong_key(frame.key, frame.key + frame.key_size);
   wrong_key[0]++;
 
   AddKeyAndExpectToSucceed(frame.key_id, frame.key_id_size,
                            &wrong_key[0], frame.key_size);
@@ skipping 203 matching lines @@
   scoped_refptr<DecoderBuffer> encrypted_data = CreateSubsampleEncryptedBuffer(
       kSubsampleData, arraysize(kSubsampleData),
       kSubsampleKeyId, arraysize(kSubsampleKeyId),
       kSubsampleIv, arraysize(kSubsampleIv),
       0,
       entries);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToFail(encrypted_data));
 }
 
 }  // namespace media