Add RealPanWalletClient for handling card unmasking requests.

components/autofill/core/browser/wallet/real_pan_wallet_client.h

Index: components/autofill/core/browser/wallet/real_pan_wallet_client.h
diff --git a/components/autofill/core/browser/wallet/real_pan_wallet_client.h b/components/autofill/core/browser/wallet/real_pan_wallet_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..c58168d4a666da8fa92c1f80aa8a196dc296d6d4
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+++ b/components/autofill/core/browser/wallet/real_pan_wallet_client.h
@@ -0,0 +1,76 @@
+// Copyright 2015 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 COMPONENTS_AUTOFILL_CORE_BROWSER_WALLET_REAL_PAN_WALLET_CLIENT_H_
+#define COMPONENTS_AUTOFILL_CORE_BROWSER_WALLET_REAL_PAN_WALLET_CLIENT_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "net/url_request/url_fetcher_delegate.h"
+
+namespace net {
+class URLFetcher;
+class URLRequestContextGetter;
+}
+
+namespace autofill {
+
+class CreditCard;
+
+namespace wallet {
+
+// RealPanWalletClient is modelled on WalletClient. Whereas the latter is used
+// for requestAutocomplete-related requests, RealPanWalletClient is used to
+// import user data from Wallet for normal web Autofill.
+class RealPanWalletClient : public net::URLFetcherDelegate {
+ public:
+  class Delegate {
+   public:
+    // Returns the real PAN retrieved from Wallet. |real_pan| will be empty
+    // on failure.
+    virtual void OnDidGetRealPan(const std::string& real_pan) = 0;
+
+    // Called to retrieve the OAuth2 token that should be used for requests
+    // to Wallet.
+    virtual std::string GetOAuth2Token() = 0;
+  };
+
+  // |context_getter| is reference counted so it has no lifetime or ownership
+  // requirements. |delegate| must outlive |this|. |source_url| is the url
+  // of the merchant page.
+  RealPanWalletClient(net::URLRequestContextGetter* context_getter,
+                      Delegate* delegate);
+
+  ~RealPanWalletClient() override;
+
+  // The user has attempted to unmask a card with the given cvc.
+  void UnmaskCard(const CreditCard& card, const std::string& cvc);
+
+  // Cancels and clears the current |request_|.
+  void CancelRequest();
+
+ private:
+  // net::URLFetcherDelegate:
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+
+  // The context for the request. Ensures the gdToken cookie is set as a header
+  // in the requests to Online Wallet if it is present.
+  scoped_refptr<net::URLRequestContextGetter> context_getter_;
+
+  // Observer class that has its various On* methods called based on the results
+  // of a request to Online Wallet.
+  Delegate* const delegate_;  // must outlive |this|.
+
+  // The current request object.
+  scoped_ptr<net::URLFetcher> request_;
+
+  base::WeakPtrFactory<RealPanWalletClient> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(RealPanWalletClient);
+};
+
+}  // namespace wallet
+}  // namespace autofill
+
+#endif  // COMPONENTS_AUTOFILL_CORE_BROWSER_WALLET_REAL_PAN_WALLET_CLIENT_H_