[Autofill] Add protobuf for Google Wallet risk parameters and a utility function for filling it out.

chrome/browser/autofill/risk/fingerprint.h

Index: chrome/browser/autofill/risk/fingerprint.h
diff --git a/chrome/browser/autofill/risk/fingerprint.h b/chrome/browser/autofill/risk/fingerprint.h
new file mode 100644
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+++ b/chrome/browser/autofill/risk/fingerprint.h
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+// Copyright (c) 2012 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 CHROME_BROWSER_AUTOFILL_RISK_FINGERPRINT_H_
+#define CHROME_BROWSER_AUTOFILL_RISK_FINGERPRINT_H_
+
+#include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "base/memory/scoped_ptr.h"
+
+class PrefServiceBase;
+
+namespace gfx {
+class Rect;
+}
+
+namespace autofill {
+namespace risk {
+
+class Fingerprint;
+
+// Asynchronously calls |callback| with statistics that, collectively, provide a
+// unique fingerprint for this (machine, user) pair, used for fraud prevention.
+// The |gaia_id| should be the user id for Google's authentication system.
+// The |window_bounds| should be the bounds of the containing Chrome window.
+// The |content_bounds| should be the bounds of the web contents view for the
+// page the user is interacting with.  The |prefs| should reflect the active
+// Chrome profile's user preferences.
+void GetFingerprint(
+    int64 gaia_id,
+    const gfx::Rect& window_bounds,
+    const gfx::Rect& content_bounds,
+    const PrefServiceBase& prefs,
+    const base::Callback<void(scoped_ptr<Fingerprint>)>& callback);
+
+}  // namespace risk
+}  // namespace autofill
+
+#endif  // CHROME_BROWSER_AUTOFILL_RISK_FINGERPRINT_H_