[Autofill] Remove direct use of base::Time::Now() in Autofill

components/autofill/core/common/autofill_clock.cc

+// Copyright 2017 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.
+
+#include "components/autofill/core/common/autofill_clock.h"
+
+#include <utility>
+
+#include "base/time/clock.h"
+#include "base/time/default_clock.h"
+
+namespace autofill {
+
+std::unique_ptr<base::Clock> AutofillClock::clock_;

[Roger McFarlane (Chromium), 2017/01/31 19:05:54]

I think the autofill clock might need to be a singleton. We generally avoid any
static variables that are not statically initialized or require destructors.

You can turn Now() into GetInstance()->Now() internally.

[sebsg, 2017/01/31 21:55:56]

Done.

+
+// static
+base::Time AutofillClock::Now() {
+  if (!clock_)
+    SetClock();
+
+  return clock_->Now();
+}
+
+// static
+void AutofillClock::SetClock() {
+  clock_.reset(new base::DefaultClock());
+}
+
+// static
+void AutofillClock::SetTestClock(std::unique_ptr<base::Clock> clock) {
+  clock_ = std::move(clock);
+}
+
+}  // namespace autofill