scheduler: Throttle timers in out-of-view frames

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 5e28c3f52aca23b5c2eaf86e58803b7302c1285f..0e98083de518045774f2919ede305be82eb6208d 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -132,6 +132,10 @@ const base::Feature kSpeculativeLaunchServiceWorker{
 const base::Feature kStaleWhileRevalidate{"StaleWhileRevalidate2",
                                           base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Throttle Blink timers in out-of-view cross origin frames.
+const base::Feature kTimerThrottlingForHiddenFrames{
+    "TimerThrottlingForHiddenFrames", base::FEATURE_ENABLED_BY_DEFAULT};
+
 // Enables token binding
 // (https://www.ietf.org/id/draft-ietf-tokbind-protocol-04.txt).
 const base::Feature kTokenBinding{"token-binding",