Expose a constructor for WebCryptoAlgorithm.

Source/core/platform/chromium/support/WebCryptoAlgorithm.cpp

Index: Source/core/platform/chromium/support/WebCryptoAlgorithm.cpp
diff --git a/Source/core/platform/chromium/support/WebCryptoAlgorithm.cpp b/Source/core/platform/chromium/support/WebCryptoAlgorithm.cpp
index 309ba566974d5d3f484a09f417a2db29114e66ec..b913cb85416fde41a70412917c10c20aed473b19 100644
--- a/Source/core/platform/chromium/support/WebCryptoAlgorithm.cpp
+++ b/Source/core/platform/chromium/support/WebCryptoAlgorithm.cpp
@@ -56,6 +56,11 @@ WebCryptoAlgorithm::WebCryptoAlgorithm(WebCryptoAlgorithmId id, const char* name
 {
 }
 
+WebCryptoAlgorithm WebCryptoAlgorithm::adoptParamsAndCreate(WebCryptoAlgorithmId id, const char* name, WebCryptoAlgorithmParams* params)
+{
+    return WebCryptoAlgorithm(id, name, adoptPtr(params));
+}
+
 WebCryptoAlgorithmId WebCryptoAlgorithm::id() const
 {
     return m_private->id;