Add a feature flag for enabling rendering pipeline throttling

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 2cc763cd1f66aba9a71e30f560e6f5a58bb81a3b..39eb2b8c1772075e5421d1c17d386713172153da 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -83,6 +83,10 @@ const base::Feature kPaintOptimizations{"PaintOptimizations",
 const base::Feature kPointerEvents{"PointerEvent",
                                    base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Throttle Blink's rendering pipeline based on frame visibility.
+const base::Feature kRenderingPipelineThrottling{
+    "RenderingPipelineThrottling", base::FEATURE_ENABLED_BY_DEFAULT};
+
 // Scrolls to compensate for layout movements (bit.ly/scroll-anchoring).
 const base::Feature kScrollAnchoring{"ScrollAnchoring",
                                      base::FEATURE_DISABLED_BY_DEFAULT};