| // Copyright 2021 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 "third_party/blink/renderer/platform/back_forward_cache_utils.h" |
| |
| #include "base/feature_list.h" |
| #include "base/metrics/field_trial_params.h" |
| #include "third_party/blink/public/common/features.h" |
| #include "third_party/blink/renderer/platform/runtime_enabled_features.h" |
| |
| namespace blink { |
| |
| bool IsInflightNetworkRequestBackForwardCacheSupportEnabled() { |
| // Note that the call to RuntimeEnabledFeatures::BackForwardCacheEnabled() |
| // must be done first to ensure we will never call |
| // base::FeatureList::IsEnabled(features::kLoadingTasksUnfreezable) when |
| // back-forward cache is not enabled. This is important because IsEnabled() |
| // might trigger activation of the current user in BackForwardCache's field |
| // trial group even though it shouldn't (e.g. when BackForwardCache is |
| // disabled due to low RAM), lowering the back-forward cache hit rate. |
| // TODO(rakina): Remove BackForwardCache from RuntimeEnabledFeatures and move |
| // features::kBackForwardCache and BackForwardCacheMemoryControls from |
| // content/ to blink/public, so that we can combine this check with the checks |
| // in content/. |
| return RuntimeEnabledFeatures::BackForwardCacheEnabled() && |
| base::FeatureList::IsEnabled(features::kLoadingTasksUnfreezable); |
| } |
| |
| int GetLoadingTasksUnfreezableParamAsInt(const std::string& param_name, |
| int default_value) { |
| if (!IsInflightNetworkRequestBackForwardCacheSupportEnabled()) |
| return default_value; |
| return base::GetFieldTrialParamByFeatureAsInt( |
| blink::features::kLoadingTasksUnfreezable, param_name, default_value); |
| } |
| |
| } // namespace blink |
