Expose WebCrypto's lookupAlgorithmInfo.

public/platform/WebCryptoAlgorithm.h

Index: public/platform/WebCryptoAlgorithm.h
diff --git a/public/platform/WebCryptoAlgorithm.h b/public/platform/WebCryptoAlgorithm.h
index 0a8e9b49c2d67ad6b5008af39e38771e1239afee..f0be9542ee3262b05d31b3447ed8cfbb4dff6547 100644
--- a/public/platform/WebCryptoAlgorithm.h
+++ b/public/platform/WebCryptoAlgorithm.h
@@ -115,6 +115,11 @@ public:
     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); }