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

chrome/browser/autofill/risk/machine_fingerprint.h

+// 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_MACHINE_FINGERPRINT_H_
+#define CHROME_BROWSER_AUTOFILL_RISK_MACHINE_FINGERPRINT_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace gfx {
+class Rect;
+}
+
+namespace autofill {
+namespace risk {
+
+class BrowserNativeFingerprinting;
+
+// Fills |data| with statistics that, collectively, constitute a unique
+// fingerprint for this (machine, |gaia_id|) pair.  The GAIA id is the user id
+// for Google's authentication system.
+void GetMachineFingerprint(int64 gaia_id,

[Albert Bodenhamer, 2012/12/19 22:14:18]

Should we consider adding some sort of protection to require the TOS to be
accepted before this can be called?  It could act as a safety net to prevent a
caller from accidentally sending this data incorrectly.

[Ilya Sherman, 2012/12/20 04:06:49]

I'm not aware of any way to check that currently; but I've added a TODO.

+                           const gfx::Rect& window_rect,
+                           const gfx::Rect& content_rect,
+                           scoped_ptr<BrowserNativeFingerprinting> data);
+
+}  // namespace risk
+}  // namespace autofill
+
+
+#endif  // CHROME_BROWSER_AUTOFILL_RISK_MACHINE_FINGERPRINT_H_