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

media/crypto/aes_decryptor_unittest.cc

Index: media/crypto/aes_decryptor_unittest.cc
diff --git a/media/crypto/aes_decryptor_unittest.cc b/media/crypto/aes_decryptor_unittest.cc
index 34354a4a657a7740aae40b5ee1820351a9189510..408de0485fdb986b8b4ca3246eaacb2524424bc6 100644
--- a/media/crypto/aes_decryptor_unittest.cc
+++ b/media/crypto/aes_decryptor_unittest.cc
@@ -240,7 +240,6 @@ class AesDecryptorTest : public testing::Test {
   }
 
   void DecryptAndExpectToFail(const uint8* data, int data_size,
-                              const uint8* plain_text, int plain_text_size,
                               const uint8* key_id, int key_id_size) {
     scoped_refptr<DecoderBuffer> encrypted_data =
         CreateWebMEncryptedBuffer(data, data_size, key_id, key_id_size);
@@ -275,12 +274,21 @@ TEST_F(AesDecryptorTest, WrongKey) {
                            kWebmWrongKey, arraysize(kWebmWrongKey));
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToFail(frame.encrypted_data,
                                                  frame.encrypted_data_size,
-                                                 frame.plain_text,
-                                                 frame.plain_text_size,
                                                  frame.key_id,
                                                  frame.key_id_size));
 }
 
+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);
@@ -288,8 +296,6 @@ TEST_F(AesDecryptorTest, KeyReplacement) {
                            kWebmWrongKey, arraysize(kWebmWrongKey));
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToFail(frame.encrypted_data,
                                                  frame.encrypted_data_size,
-                                                 frame.plain_text,
-                                                 frame.plain_text_size,
                                                  frame.key_id,
                                                  frame.key_id_size));
   AddKeyAndExpectToSucceed(frame.key_id, frame.key_id_size,
@@ -349,8 +355,6 @@ TEST_F(AesDecryptorTest, HmacCheckFailure) {
                            frame.key, frame.key_size);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToFail(kWebmFrame0HmacDataChanged,
                                                  frame.encrypted_data_size,
-                                                 frame.plain_text,
-                                                 frame.plain_text_size,
                                                  frame.key_id,
                                                  frame.key_id_size));
 }
@@ -362,8 +366,6 @@ TEST_F(AesDecryptorTest, IvCheckFailure) {
                            frame.key, frame.key_size);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToFail(kWebmFrame0IvDataChanged,
                                                  frame.encrypted_data_size,
-                                                 frame.plain_text,
-                                                 frame.plain_text_size,
                                                  frame.key_id,
                                                  frame.key_id_size));
 }
@@ -375,8 +377,6 @@ TEST_F(AesDecryptorTest, DataCheckFailure) {
                            frame.key, frame.key_size);
   ASSERT_NO_FATAL_FAILURE(DecryptAndExpectToFail(kWebmFrame0FrameDataChanged,
                                                  frame.encrypted_data_size,
-                                                 frame.plain_text,
-                                                 frame.plain_text_size,
                                                  frame.key_id,
                                                  frame.key_id_size));
 }