Support for the new WebCrypto digest by chunks API.

content/child/webcrypto/webcrypto_impl.cc

Index: content/child/webcrypto/webcrypto_impl.cc
diff --git a/content/child/webcrypto/webcrypto_impl.cc b/content/child/webcrypto/webcrypto_impl.cc
index 076df0d4a3e14296ef9ca7f06f6207f9d6fffd60..b5db4a70aaf36684b73f0e35e8b3f34a2c5f2dfe 100644
--- a/content/child/webcrypto/webcrypto_impl.cc
+++ b/content/child/webcrypto/webcrypto_impl.cc
@@ -5,6 +5,7 @@
 #include "content/child/webcrypto/webcrypto_impl.h"
 
 #include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
 #include "content/child/webcrypto/crypto_data.h"
 #include "content/child/webcrypto/shared_crypto.h"
 #include "content/child/webcrypto/status.h"
@@ -248,6 +249,11 @@ bool WebCryptoImpl::digestSynchronous(
       .IsSuccess();
 }
 
+blink::WebCryptoDigestor* WebCryptoImpl::createDigestor(
+    const blink::WebCryptoAlgorithmId algorithm_id) {
+  return webcrypto::CreateDigestor(algorithm_id).release();
+}
+
 bool WebCryptoImpl::deserializeKeyForClone(
     const blink::WebCryptoKeyAlgorithm& algorithm,
     blink::WebCryptoKeyType type,