WebCrypto: Add interfaces for importKey().

public/platform/WebCryptoKey.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 40 matching lines @@
     WebCryptoKeyUsageWrapKey = 1 << 5,
     WebCryptoKeyUsageUnwrapKey = 1 << 6,
 #if WEBKIT_IMPLEMENTATION
     EndOfWebCryptoKeyUsage,
 #endif
 };
 
 // A bitfield of WebCryptoKeyUsage
 typedef int WebCryptoKeyUsageMask;
 
+enum WebCryptoKeyFormat {
+    WebCryptoKeyFormatRaw,
+    WebCryptoKeyFormatPkcs8,
+    WebCryptoKeyFormatSpki,
+    WebCryptoKeyFormatJwk,
+};
+
 class WebCryptoAlgorithm;
 class WebCryptoKeyPrivate;
 class WebCryptoKeyHandle;
 
 // The WebCryptoKey represents a key from the Web Crypto API:
 //
 // https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html#key-interface
 //
 // WebCryptoKey is just a reference-counted wrapper that manages the lifetime of
 // a "WebCryptoKeyHandle*".
@@ skipping 48 matching lines @@
 // Base class for the embedder to define its own opaque key handle. The lifetime
 // of this object is controlled by WebCryptoKey using reference counting.
 class WebCryptoKeyHandle {
 public:
     virtual ~WebCryptoKeyHandle() { }
 };
 
 } // namespace WebKit
 
 #endif