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// Copyright 2020 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.
// This header contains field trial and variations definitions for policies,
// mechanisms and features in the performance_manager component.
#include "components/performance_manager/public/features.h"
#include "base/metrics/field_trial_params.h"
namespace performance_manager {
namespace features {
const base::Feature kTabLoadingFrameNavigationThrottles{
"TabLoadingFrameNavigationThrottles", base::FEATURE_DISABLED_BY_DEFAULT};
// Parameters associated with the "TabLoadingFrameNavigationThrottles"
// feature.
const base::FeatureParam<int> kMinimumThrottleTimeoutMilliseconds = {
&kTabLoadingFrameNavigationThrottles, "MinimumThrottleTimeoutMilliseconds",
1000};
// This defaults to the 99th %ile of LargestContentfulPaint (LCP).
const base::FeatureParam<int> kMaximumThrottleTimeoutMilliseconds = {
&kTabLoadingFrameNavigationThrottles, "MaximumThrottleTimeoutMilliseconds",
40000};
// This defaults to 3 since 3 * 99th%ile FCP ~= 99th%ile LCP.
const base::FeatureParam<double> kFCPMultiple = {
&kTabLoadingFrameNavigationThrottles, "FCPMultiple", 3.0};
TabLoadingFrameNavigationThrottlesParams::
TabLoadingFrameNavigationThrottlesParams() = default;
TabLoadingFrameNavigationThrottlesParams::
~TabLoadingFrameNavigationThrottlesParams() = default;
// static
TabLoadingFrameNavigationThrottlesParams
TabLoadingFrameNavigationThrottlesParams::GetParams() {
TabLoadingFrameNavigationThrottlesParams params;
params.minimum_throttle_timeout = base::TimeDelta::FromMilliseconds(
kMinimumThrottleTimeoutMilliseconds.Get());
params.maximum_throttle_timeout = base::TimeDelta::FromMilliseconds(
kMaximumThrottleTimeoutMilliseconds.Get());
params.fcp_multiple = kFCPMultiple.Get();
return params;
}
} // namespace features
} // namespace performance_manager
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