Add a feature flag for enabling rendering pipeline throttling

content/public/common/content_features.cc

 // Copyright 2015 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 "build/build_config.h"
 #include "content/public/common/content_features.h"
 
 namespace features {
 
 // All features in alphabetical order.
@@ skipping 70 matching lines @@
                                   base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Paint optimizations including subsequence caching and empty phase skipping.
 const base::Feature kPaintOptimizations{"PaintOptimizations",
                                         base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Partial support for pointer event feature.
 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};
 
 // Enables implementation of the Cache-Control: stale-while-revalidate directive
 // which permits servers to allow the use of stale resources while revalidation
 // proceeds in the background. See http://crbug.com/348877
 const base::Feature kStaleWhileRevalidate{"StaleWhileRevalidate2",
                                           base::FEATURE_DISABLED_BY_DEFAULT};
 
@@ skipping 20 matching lines @@
 // we will not use replica editor and do a round trip to renderer to synchronize
 // with Blink data.
 const base::Feature kImeThread{"ImeThread", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // FeatureList definition for the Seccomp field trial.
 const base::Feature kSeccompSandboxAndroid{"SeccompSandboxAndroid",
                                            base::FEATURE_DISABLED_BY_DEFAULT};
 #endif
 
 }  // namespace features