[webcrypto] Make operations run on a background thread so they don't block the blink thread.

content/child/webcrypto/status.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_CHILD_WEBCRYPTO_STATUS_H_
 #define CONTENT_CHILD_WEBCRYPTO_STATUS_H_
 
 #include <string>
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/WebCrypto.h"
 
 namespace content {
 
 namespace webcrypto {
 
 // Status indicates whether an operation completed successfully, or with an
 // error. The error is used for verification in unit-tests, as well as for
 // display to the user.
 //
 // As such, it is important that errors DO NOT reveal any sensitive material
 // (like key bytes).
 //
-// Care must be taken with what errors are reported back to blink when doing
+// Care must be taken with what errors are reported back to Blink when doing
 // compound operations like unwrapping a JWK key. In this case, errors
 // generated by the JWK import are not appropriate to report since the wrapped
 // JWK is not visible to the caller.
 class CONTENT_EXPORT Status {
  public:
+  Status() : type_(TYPE_ERROR) {}
+
   // Returns true if the Status represents an error (any one of them).
   bool IsError() const;
 
   // Returns true if the Status represent success.
   bool IsSuccess() const;
 
   // Returns a UTF-8 error message (non-localized) describing the error.
   const std::string& error_details() const { return error_details_; }
 
   blink::WebCryptoErrorType error_type() const { return error_type_; }
@@ skipping 160 matching lines @@
   Type type_;
   blink::WebCryptoErrorType error_type_;
   std::string error_details_;
 };
 
 }  // namespace webcrypto
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEBCRYPTO_STATUS_H_