html_viewer: Move webcrypto to a place where html_viewer can use it.

content/child/webcrypto/generate_key_result.h

-// Copyright 2014 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.
-
-#ifndef CONTENT_CHILD_WEBCRYPTO_GENERATE_KEY_RESULT_H_
-#define CONTENT_CHILD_WEBCRYPTO_GENERATE_KEY_RESULT_H_
-
-#include "content/common/content_export.h"
-#include "third_party/WebKit/public/platform/WebCrypto.h"
-
-namespace content {
-
-namespace webcrypto {
-
-// This is the result object when generating keys. It encapsulates either a
-// secret key, or a public/private key pair.
-class CONTENT_EXPORT GenerateKeyResult {
- public:
-  enum Type {
-    // An empty (or "null") result.
-    TYPE_NULL,
-
-    // The result is a secret key, accessible through secret_key()
-    TYPE_SECRET_KEY,
-
-    // The result is a public/private key pair, accessible through public_key()
-    // and private_key()
-    TYPE_PUBLIC_PRIVATE_KEY_PAIR
-  };
-
-  // Initializes a "null" instance.
-  GenerateKeyResult();
-
-  Type type() const;
-
-  const blink::WebCryptoKey& secret_key() const;
-  const blink::WebCryptoKey& public_key() const;
-  const blink::WebCryptoKey& private_key() const;
-
-  void AssignSecretKey(const blink::WebCryptoKey& key);
-  void AssignKeyPair(const blink::WebCryptoKey& public_key,
-                     const blink::WebCryptoKey& private_key);
-
-  // Sends the key(s) to the Blink result. Should not be called for "null"
-  // results.
-  void Complete(blink::WebCryptoResult* out) const;
-
- private:
-  Type type_;
-
-  blink::WebCryptoKey secret_key_;
-  blink::WebCryptoKey public_key_;
-  blink::WebCryptoKey private_key_;
-};
-
-}  // namespace webcrypto
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_WEBCRYPTO_GENERATE_KEY_RESULT_H_