Check that usage isn't empty when generateKey() is called

content/child/webcrypto/test/aes_cbc_unittest.cc

Index: content/child/webcrypto/test/aes_cbc_unittest.cc
diff --git a/content/child/webcrypto/test/aes_cbc_unittest.cc b/content/child/webcrypto/test/aes_cbc_unittest.cc
index c6fe95dab2617a1777f6e5e875902b0dade28e8c..3eb9877b3906226b8ca5bcb32c5ffd6469790815 100644
--- a/content/child/webcrypto/test/aes_cbc_unittest.cc
+++ b/content/child/webcrypto/test/aes_cbc_unittest.cc
@@ -265,7 +265,7 @@ TEST(WebCryptoAesCbcTest, GenerateKeyIsRandom) {
                 GenerateSecretKey(
                     CreateAesCbcKeyGenAlgorithm(kKeyLength[key_length_i]),
                     true,
-                    0,
+                    blink::WebCryptoKeyUsageEncrypt,
                     &key));
       EXPECT_TRUE(key.handle());
       EXPECT_EQ(blink::WebCryptoKeyTypeSecret, key.type());
@@ -962,6 +962,15 @@ TEST(WebCryptoAesCbcTest, GenerateKeyBadUsages) {
   }
 }
 
+// Generate an AES-CBC key with no usages.
+TEST(WebCryptoAesCbcTest, GenerateKeyEmptyUsages) {
+  blink::WebCryptoKey key;
+
+  ASSERT_EQ(Status::ErrorCreateKeyBadUsages(),
+            GenerateSecretKey(
+                CreateAesCbcKeyGenAlgorithm(128), true, 0, &key));
+}
+
 // Generate an AES-CBC key and an RSA key pair. Use the AES-CBC key to wrap the
 // key pair (using SPKI format for public key, PKCS8 format for private key).
 // Then unwrap the wrapped key pair and verify that the key data is the same.
@@ -991,7 +1000,7 @@ TEST(WebCryptoAesCbcTest, WrapUnwrapRoundtripSpkiPkcs8) {
                                 modulus_length,
                                 public_exponent),
                             true,
-                            0,
+                            blink::WebCryptoKeyUsageSign,
                             &public_key,
                             &private_key));
 
@@ -1053,7 +1062,7 @@ TEST(WebCryptoAesCbcTest, WrapUnwrapRoundtripSpkiPkcs8) {
                       wrap_algorithm,
                       rsa_import_algorithm,
                       true,
-                      0,
+                      blink::WebCryptoKeyUsageSign,
                       &unwrapped_private_key));
 
   // Export unwrapped key pair as SPKI + PKCS8