Expose WebCrypto's lookupAlgorithmInfo.

public/platform/WebCryptoAlgorithm.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 97 matching lines @@
 class WebCryptoAlgorithm {
 public:
 #if INSIDE_BLINK
     WebCryptoAlgorithm() { }
     BLINK_PLATFORM_EXPORT WebCryptoAlgorithm(WebCryptoAlgorithmId, PassOwnPtr<WebCryptoAlgorithmParams>);
 #endif
 
     BLINK_PLATFORM_EXPORT static WebCryptoAlgorithm createNull();
     BLINK_PLATFORM_EXPORT static WebCryptoAlgorithm adoptParamsAndCreate(WebCryptoAlgorithmId, WebCryptoAlgorithmParams*);
 
+    // Returns the canonical (case-sensitive) name for the algorithm with the
+    // given ID as a null-terminated C-string literal. Caller can assume the
+    // pointer will be valid for the program's entire runtime.
+    BLINK_PLATFORM_EXPORT static const char* idToName(WebCryptoAlgorithmId);
+
     ~WebCryptoAlgorithm() { reset(); }
 
     WebCryptoAlgorithm(const WebCryptoAlgorithm& other) { assign(other); }
     WebCryptoAlgorithm& operator=(const WebCryptoAlgorithm& other)
     {
         assign(other);
         return *this;
     }
 
     BLINK_PLATFORM_EXPORT bool isNull() const;
@@ skipping 20 matching lines @@
 private:
     BLINK_PLATFORM_EXPORT void assign(const WebCryptoAlgorithm& other);
     BLINK_PLATFORM_EXPORT void reset();
 
     WebPrivatePtr<WebCryptoAlgorithmPrivate> m_private;
 };
 
 } // namespace blink
 
 #endif