File: background_tab_loading_policy_helpers.h

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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_PERFORMANCE_MANAGER_POLICIES_BACKGROUND_TAB_LOADING_POLICY_HELPERS_H_
#define CHROME_BROWSER_PERFORMANCE_MANAGER_POLICIES_BACKGROUND_TAB_LOADING_POLICY_HELPERS_H_

#include <stddef.h>

namespace performance_manager {

namespace policies {

// Helper function for BackgroundTabLoadingPolicy to compute the number of
// tabs that can load simultaneously.
size_t CalculateMaxSimultaneousTabLoads(size_t lower_bound,
                                        size_t upper_bound,
                                        size_t cores_per_load,
                                        size_t num_cores);

// Calculates a score for the "age" of the tab. This is a value between 0
// (inclusive) and 1 (exclusive), where higher values are attributed to newer
// tabs.
float CalculateAgeScore(double last_visibility_change_seconds);

}  // namespace policies

}  // namespace performance_manager

#endif  // CHROME_BROWSER_PERFORMANCE_MANAGER_POLICIES_BACKGROUND_TAB_LOADING_POLICY_HELPERS_H_