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 b257fc39ec1528db416706ae5fe310bbef31b389..fae2e5a68d8d660c5dcf8d03a6e84808730c7361 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -88,6 +88,10 @@ 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};