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

content/renderer/webcrypto/webcrypto_impl.h

Index: content/renderer/webcrypto/webcrypto_impl.h
diff --git a/content/renderer/webcrypto/webcrypto_impl.h b/content/renderer/webcrypto/webcrypto_impl.h
index e58704408c66eb9cbc55942286ff277c395bf199..9b2dd3e031d1edd295e428fa610852be15336d75 100644
--- a/content/renderer/webcrypto/webcrypto_impl.h
+++ b/content/renderer/webcrypto/webcrypto_impl.h
@@ -24,6 +24,12 @@ class CONTENT_EXPORT WebCryptoImpl
       const unsigned char* data,
       unsigned data_size,
       WebKit::WebCryptoResult result);
+  virtual void decrypt(
+      const WebKit::WebCryptoAlgorithm& algorithm,
+      const WebKit::WebCryptoKey& key,
+      const unsigned char* data,
+      unsigned data_size,
+      WebKit::WebCryptoResult result);
   virtual void digest(
       const WebKit::WebCryptoAlgorithm& algorithm,
       const unsigned char* data,
@@ -63,6 +69,12 @@ class CONTENT_EXPORT WebCryptoImpl
       const unsigned char* data,
       unsigned data_size,
       WebKit::WebArrayBuffer* buffer);
+  bool DecryptInternal(
+      const WebKit::WebCryptoAlgorithm& algorithm,
+      const WebKit::WebCryptoKey& key,
+      const unsigned char* data,
+      unsigned data_size,
+      WebKit::WebArrayBuffer* buffer);
   bool DigestInternal(
       const WebKit::WebCryptoAlgorithm& algorithm,
       const unsigned char* data,