| // 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 |