[WebPayments] Implement state transitions in desktop WebPayments dialog.

chrome/browser/ui/views/payments/payment_dialog_state.cc

+// Copyright 2016 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 "chrome/browser/ui/views/payments/payment_dialog_state.h"
+
+#include "ui/views/view.h"
+
+namespace payments {
+
+PaymentDialogState::PaymentDialogState()

[please use gerrit instead, 2016/12/07 23:29:19]

Please initialize interactiable_ boolean here. Otherwise it's random.

[anthonyvd, 2016/12/08 20:31:22]

Ack. interactable_ doesn't exist anymore as of patchset 6.

+  : view_(nullptr) {}

[sky, 2016/12/08 03:58:17]

No need to initialize view_ here (default value is fine).

[anthonyvd, 2016/12/08 20:31:22]

Done.

+
+PaymentDialogState::~PaymentDialogState() {}
+
+views::View* PaymentDialogState::GetView() {
+  if (!view_) {
+    view_.reset(CreateView());
+    view_->set_owned_by_client();
+  }
+
+  return view_.get();
+}
+
+}  // namespace payments