[webcrypto] Add decrypt() for AES-CBC.

content/renderer/webcrypto_impl_openssl.cc

 // Copyright 2013 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 "content/renderer/webcrypto_impl.h"
 
 namespace content {
 
 void WebCryptoImpl::Init() {
 }
 
 bool WebCryptoImpl::EncryptInternal(
     const WebKit::WebCryptoAlgorithm& algorithm,
     const WebKit::WebCryptoKey& key,
     const unsigned char* data,
     unsigned data_size,
     WebKit::WebArrayBuffer* buffer) {
   return false;
 }
 
+bool WebCryptoImpl::DecryptInternal(
+    const WebKit::WebCryptoAlgorithm& algorithm,
+    const WebKit::WebCryptoKey& key,
+    const unsigned char* data,
+    unsigned data_size,
+    WebKit::WebArrayBuffer* buffer) {
+  return false;
+}
+
 bool WebCryptoImpl::DigestInternal(
     const WebKit::WebCryptoAlgorithm& algorithm,
     const unsigned char* data,
     unsigned data_size,
     WebKit::WebArrayBuffer* buffer) {
   // TODO(bryaneyler): Placeholder for OpenSSL implementation.
   // Issue http://crbug.com/267888.
   return false;
 }
 
@@ skipping 15 matching lines @@
     const WebKit::WebCryptoKey& key,
     const unsigned char* data,
     unsigned data_size,
     WebKit::WebArrayBuffer* buffer) {
   // TODO(bryaneyler): Placeholder for OpenSSL implementation.
   // Issue http://crbug.com/267888.
   return false;
 }
 
 }  // namespace content