[scheduler] Throttle background frames with 1% CPU limit

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index aa16cb115d29630ac9bb894a33a283a53a821512..426ef7b0cfc8cd1469912ab7c95081d575de0bab 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -45,6 +45,11 @@ const base::Feature kDefaultEnableGpuRasterization{
 const base::Feature kDocumentWriteEvaluator{"DocumentWriteEvaluator",
                                             base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Throttle tasks in Blink background timer queues based on CPU budgets
+// for the background tab. Bug: https://crbug.com/639852.
+const base::Feature kExpensiveBackgroundTimerThrottling{
+    "ExpensiveBackgroundTimerThrottling", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Enables the Feature Policy framework for granting and removing access to
 // other features through HTTP headers.
 const base::Feature kFeaturePolicy{"FeaturePolicy",