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// Copyright 2015 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_DOM_PERFORMANCE_TIMING_H_
#define COBALT_DOM_PERFORMANCE_TIMING_H_
#include "cobalt/script/wrappable.h"
#include "base/time/time.h"
#include "cobalt/base/clock.h"
namespace cobalt {
namespace dom {
// Implements the PerformanceTiming IDL interface, as described here:
// https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationTiming/Overview.html#sec-navigation-timing-interface
class PerformanceTiming : public script::Wrappable {
public:
explicit PerformanceTiming(const scoped_refptr<base::BasicClock>& clock);
// This attribute must return the time immediately after the user agent
// finishes prompting to unload the previous document. If there is no previous
// document, this attribute must return the time the current document is
// created.
uint64 navigation_start() const;
// Custom, not in any spec.
// Returns a clock that is relative to the navigation start time, and based
// off of the clock passed into Performance (the one that navigation start
// time was derived from).
scoped_refptr<base::OffsetClock> GetNavigationStartClock();
DEFINE_WRAPPABLE_TYPE(PerformanceTiming);
private:
~PerformanceTiming();
// The navigation start time relative to January 1, 1970.
base::TimeDelta navigation_start_;
scoped_refptr<base::OffsetClock> navigation_start_clock_;
DISALLOW_COPY_AND_ASSIGN(PerformanceTiming);
};
} // namespace dom
} // namespace cobalt
#endif // COBALT_DOM_PERFORMANCE_TIMING_H_