Add digestSynchronous WebCrypto method.

public/platform/WebCrypto.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 160 matching lines @@
     virtual void verifySignature(const WebCryptoAlgorithm&, const WebCryptoKey&, const unsigned char* signature, unsigned signatureSize, const unsigned char* data, unsigned dataSize, WebCryptoResult result) { result.completeWithError(); }
     virtual void digest(const WebCryptoAlgorithm&, const unsigned char* data, unsigned dataSize, WebCryptoResult result) { result.completeWithError(); }
     virtual void generateKey(const WebCryptoAlgorithm&, bool extractable, WebCryptoKeyUsageMask, WebCryptoResult result) { result.completeWithError(); }
     // It is possible for the WebCryptoAlgorithm to be "isNull()"
     virtual void importKey(WebCryptoKeyFormat, const unsigned char* keyData, unsigned keyDataSize, const WebCryptoAlgorithm&, bool extractable, WebCryptoKeyUsageMask, WebCryptoResult result) { result.completeWithError(); }
     virtual void exportKey(WebCryptoKeyFormat, const WebCryptoKey&, WebCryptoResult result) { result.completeWithError(); }
     virtual void wrapKey(WebCryptoKeyFormat, const WebCryptoKey& key, const WebCryptoKey& wrappingKey, const WebCryptoAlgorithm&, WebCryptoResult result) { result.completeWithError(); }
     // It is possible that unwrappedKeyAlgorithm.isNull()
     virtual void unwrapKey(WebCryptoKeyFormat, const unsigned char* wrappedKey, unsigned wrappedKeySize, const WebCryptoKey&, const WebCryptoAlgorithm& unwrapAlgorithm, const WebCryptoAlgorithm& unwrappedKeyAlgorithm, bool extractable, WebCryptoKeyUsageMask, WebCryptoResult result) { result.completeWithError(); }
 
+    // This is the one exception to the "Completeing the request" guarantees

[eroman, 2014/02/08 00:03:40]

typo completing

[jww, 2014/02/08 00:41:55]

Done.

+    // outlined above. digestSynchronous must provide the result synchronously.
+    // Consumers may assume that the result object will have one of its
+    // "complete" functions called before digestSynchronous returns.
+    //
+    // This is useful for Blink internal crypto and is not part of the
+    // WebCrypto standard.
+    virtual void digestSynchronous(const WebCryptoAlgorithm&, const unsigned char* data, unsigned dataSize, WebCryptoResult result) { result.completeWithError(); }

[eroman, 2014/02/08 00:03:40]

Is it going to be convenient enough having "WebCryptoResult" here? This mean
clients will have to provide their own implementation to extract the result.

What about having the return value be a boolean for success, and the input be a
vector

[jww, 2014/02/08 00:41:55]

That works for me. I was trying to keep the API similar to the other methods,
but I suppose there's no reason for that.

+
 protected:
     virtual ~WebCrypto() { }
 };
 
 } // namespace blink
 
 #endif