[webcrypto] Add the KeyAlgorithm interface.

Source/modules/crypto/RsaHashedKeyAlgorithm.h

Index: Source/modules/crypto/RsaHashedKeyAlgorithm.h
diff --git a/Source/core/css/CSSFontSelectorClient.h b/Source/modules/crypto/RsaHashedKeyAlgorithm.h
similarity index 78%
copy from Source/core/css/CSSFontSelectorClient.h
copy to Source/modules/crypto/RsaHashedKeyAlgorithm.h
index 28a6c87742256f5224d530dc9d9110cf48f0a86e..db1af7badbaaf79234501aaa739c677124e24788 100644
--- a/Source/core/css/CSSFontSelectorClient.h
+++ b/Source/modules/crypto/RsaHashedKeyAlgorithm.h
@@ -28,20 +28,27 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef CSSFontSelectorClient_h
-#define CSSFontSelectorClient_h
+#ifndef RsaHashedKeyAlgorithm_h
+#define RsaHashedKeyAlgorithm_h
 
-namespace WebCore {
+#include "modules/crypto/RsaKeyAlgorithm.h"
 
-class CSSFontSelector;
+namespace WebCore {
 
-class CSSFontSelectorClient {
+class RsaHashedKeyAlgorithm : public RsaKeyAlgorithm {
 public:
-    virtual ~CSSFontSelectorClient() { }
+    static PassRefPtrWillBeRawPtr<RsaHashedKeyAlgorithm> create(const blink::WebCryptoKeyAlgorithm&);
+
+    KeyAlgorithm* hash();
+
+    void trace(Visitor*);
+
+protected:
+    RsaHashedKeyAlgorithm(const blink::WebCryptoKeyAlgorithm&);
 
-    virtual void fontsNeedUpdate(CSSFontSelector*) = 0;
+    RefPtrWillBeMember<KeyAlgorithm> m_hash;
 };
 
 } // namespace WebCore
 
-#endif // CSSFontSelectorClient_h
+#endif