[webcrypto] Expose crypto.subtle to web workers.

Source/bindings/v8/custom/V8CryptoCustom.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 17 matching lines @@
 #include "bindings/v8/ExceptionMessages.h"
 #include "bindings/v8/ExceptionState.h"
 #include "bindings/v8/V8Binding.h"
 #include "bindings/v8/custom/V8ArrayBufferViewCustom.h"
 #include "core/dom/ExceptionCode.h"
 #include "modules/crypto/Crypto.h"
 #include "wtf/ArrayBufferView.h"
 
 namespace WebCore {
 
-// This custom binding is shared by V8WorkerCrypto. As such:
-//   * Do not call V8Crypto::toNative()
-//   * Must be threadsafe
 void V8Crypto::getRandomValuesMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "getRandomValues", "Crypto", info.Holder(), info.GetIsolate());
     if (info.Length() < 1) {
         exceptionState.throwTypeError(ExceptionMessages::notEnoughArguments(1, info.Length()));
         exceptionState.throwIfNeeded();
         return;
     }
 
     v8::Handle<v8::Value> buffer = info[0];
     if (!V8ArrayBufferView::hasInstance(buffer, info.GetIsolate())) {
         exceptionState.throwTypeError("First argument is not an ArrayBufferView");
     } else {
         ArrayBufferView* arrayBufferView = V8ArrayBufferView::toNative(v8::Handle<v8::Object>::Cast(buffer));
         ASSERT(arrayBufferView);
 
-        Crypto::getRandomValues(arrayBufferView, exceptionState);
+        Crypto* crypto = V8Crypto::toNative(info.Holder());
+        crypto->getRandomValues(arrayBufferView, exceptionState);
     }
 
     if (exceptionState.throwIfNeeded())
         return;
 
     v8SetReturnValue(info, buffer);
 }
 
 } // namespace WebCore