WebCrypto: Refactor the WebCryptoOperation interface to support errors.

Source/modules/crypto/CryptoOperation.h

Index: Source/modules/crypto/CryptoOperation.h
diff --git a/Source/modules/crypto/CryptoOperation.h b/Source/modules/crypto/CryptoOperation.h
index b26974dd9d66ca0e49bb83757d9af6833406e7f9..f59a60b8eee3f8d68174985d55b8ac386699b2f8 100644
--- a/Source/modules/crypto/CryptoOperation.h
+++ b/Source/modules/crypto/CryptoOperation.h
@@ -46,10 +46,10 @@ class ScriptPromiseResolver;
 
 typedef int ExceptionCode;
 
-class CryptoOperation : public ScriptWrappable, public RefCounted<CryptoOperation> {
+class CryptoOperation : public ScriptWrappable, public WebKit::WebCryptoOperationResult, public RefCounted<CryptoOperation> {
 public:
     ~CryptoOperation();
-    static PassRefPtr<CryptoOperation> create(const WebKit::WebCryptoAlgorithm&, WebKit::WebCryptoOperation*);
+    static PassRefPtr<CryptoOperation> create(const WebKit::WebCryptoAlgorithm&, ExceptionCode*);
 
     CryptoOperation* process(ArrayBuffer* data);
     CryptoOperation* process(ArrayBufferView* data);
@@ -59,11 +59,17 @@ public:
 
     Algorithm* algorithm();
 
-private:
-    class Result;
-    friend class Result;
+    // Implementation of WebKit::WebCryptoOperationResult.
+    virtual void initializationFailed() OVERRIDE;
+    virtual void initializationSucceded(WebKit::WebCryptoOperation*) OVERRIDE;
+    virtual void completeWithError() OVERRIDE;
+    virtual void completeWithArrayBuffer(const WebKit::WebArrayBuffer&) OVERRIDE;
 
+private:
     enum State {
+        // Constructing the WebCryptoOperation.
+        Initializing,
+
         // Accepting calls to process().
         Processing,
 
@@ -77,7 +83,7 @@ private:
         Done,
     };
 
-    CryptoOperation(const WebKit::WebCryptoAlgorithm&, WebKit::WebCryptoOperation*);
+    CryptoOperation(const WebKit::WebCryptoAlgorithm&, ExceptionCode*);
 
     void process(const unsigned char*, size_t);
 
@@ -94,7 +100,7 @@ private:
 
     RefPtr<ScriptPromiseResolver> m_promiseResolver;
 
-    OwnPtr<Result> m_result;
+    ExceptionCode* m_exceptionCode;
 };
 
 } // namespace WebCore