PaymentRequest.canMakePayment() query quota on desktop.

components/payments/core/can_make_payment_query.cc

Index: components/payments/core/can_make_payment_query.cc
diff --git a/components/payments/core/can_make_payment_query.cc b/components/payments/core/can_make_payment_query.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1f2296b4d9e92cdba498a70617ff20dd9348ad69
--- /dev/null
+++ b/components/payments/core/can_make_payment_query.cc
@@ -0,0 +1,45 @@
+// 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/payments/core/can_make_payment_query.h"
+
+#include <utility>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/location.h"
+#include "base/memory/ptr_util.h"
+#include "base/time/time.h"
+
+namespace payments {
+
+CanMakePaymentQuery::CanMakePaymentQuery() {}
+
+CanMakePaymentQuery::~CanMakePaymentQuery() {}
+
+bool CanMakePaymentQuery::CanQuery(
+    const GURL& iframe_origin,
+    const std::map<std::string, std::set<std::string>>& query) {
+  const auto& it = queries_.find(iframe_origin);
+  if (it == queries_.end()) {
+    std::unique_ptr<base::OneShotTimer> timer =
+        base::MakeUnique<base::OneShotTimer>();
+    timer->Start(FROM_HERE, base::TimeDelta::FromMinutes(30),
+                 base::Bind(&CanMakePaymentQuery::ExpireQuotaForIframeOrigin,
+                            base::Unretained(this), iframe_origin));
+    timers_.insert(std::make_pair(iframe_origin, std::move(timer)));
+    queries_.insert(std::make_pair(iframe_origin, query));
+    return true;
+  }
+
+  return it->second == query;
+}
+
+void CanMakePaymentQuery::ExpireQuotaForIframeOrigin(
+    const GURL& iframe_origin) {
+  timers_.erase(iframe_origin);
+  queries_.erase(iframe_origin);
+}
+
+}  // namespace payments