WebCrypto: Add interfaces for importKey().

public/platform/WebCrypto.h

Index: public/platform/WebCrypto.h
diff --git a/public/platform/WebCrypto.h b/public/platform/WebCrypto.h
index 4b091d16929eccbd290a3af61ec04e6ba0eb4b08..0b8a5da8c895ef4aa5ab50e9465139b9b8bc0f31 100644
--- a/public/platform/WebCrypto.h
+++ b/public/platform/WebCrypto.h
@@ -32,12 +32,13 @@
 #define WebCrypto_h
 
 #include "WebCommon.h"
+#include "WebCryptoKey.h"
 
 namespace WebKit {
 
 class WebArrayBuffer;
-class WebCryptoAlgorithm;
-class WebCryptoKey;
+class WebCryptoKeyOperation;
+class WebCryptoKeyOperationResult;
 class WebCryptoOperation;
 class WebCryptoOperationResult;
 
@@ -51,7 +52,7 @@ public:
     //
     // Let the WebCryptoOperationResult* be called "result".
     //
-    // Implementations can either:
+    // Before returning, implementations can either:
     //
     // * Synchronously fail initialization by calling:
     //   result->initializationFailed(errorDetails)
@@ -86,6 +87,38 @@ public:
     // the cryptoOperation.
     virtual void digest(const WebCryptoAlgorithm&, WebCryptoOperationResult*) { }
 
+    // The following methods begin an asynchronous single-part key operation.
+    //
+    // Let the WebCryptoKeyOperationResult* be called "result".
+    //
+    // Before returning, implementations can either:
+    //
+    // (a) Synchronously fail initialization by calling:
+    //     result->initializationFailed(errorDetails)
+    //     (this results in throwing a Javascript exception)
+    //
+    // (b) Synchronously complete the request (success or error) by calling:
+    //     result->completeWithXXX()
+    //
+    // (c) Defer completion by calling
+    //     result->initializationSucceeded(keyOperation)
+    //
+    // If asynchronous completion (c) was chosen, then the embedder can notify
+    // completion after returning by calling result->completeWithXXX().
+    //
+    // The keyOperation pointer MUST remain valid while it is "in progress".
+    // The keyOperation is said to be "in progress" from the time after
+    // result->initializationSucceded() has been called, up until either:
+    //
+    //   - Blink calls keyOperation->abort()
+    //   OR
+    //   - Embedder calls result->completeWithXXX()
+    //
+    // Once the keyOperation is no longer "in progress" the "result" pointer
+    // is no longer valid. At this time the embedder is responsible for freeing
+    // the cryptoOperation.
+    virtual void importKey(WebCryptoKeyFormat, const unsigned char* keyData, size_t keyDataSize, const WebCryptoAlgorithm&, bool extractable, WebCryptoKeyUsageMask, WebCryptoKeyOperationResult*) { }
+
 protected:
     virtual ~WebCrypto() { }
 };
@@ -124,6 +157,28 @@ protected:
     virtual ~WebCryptoOperationResult() { }
 };
 
+class WebCryptoKeyOperation {
+public:
+    // Cancels the in-progress operation.
+    //   * Implementations should delete |this| after aborting.
+    virtual void abort() = 0;
+
+protected:
+    virtual ~WebCryptoKeyOperation() { }
+};
+
+class WebCryptoKeyOperationResult {
+public:
+    virtual void initializationFailed() = 0;
+    virtual void initializationSucceeded(WebCryptoKeyOperation*) = 0;
+
+    virtual void completeWithError() = 0;
+    virtual void completeWithKey(const WebCryptoKey&) = 0;
+
+protected:
+    virtual ~WebCryptoKeyOperationResult() { }
+};
+
 } // namespace WebKit
 
 #endif