[Media] Plumb a feature parameter for the background video keyframe distance.

content/browser/renderer_host/render_view_host_impl.cc

 // Copyright (c) 2012 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 "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 522 matching lines @@
   prefs.v8_cache_options = GetV8CacheOptions();
 
   prefs.user_gesture_required_for_presentation = !command_line.HasSwitch(
       switches::kDisableGestureRequirementForPresentation);
 
   if (delegate_ && delegate_->HideDownloadUI())
     prefs.hide_download_ui = true;
 
   prefs.background_video_track_optimization_enabled =
       base::FeatureList::IsEnabled(media::kBackgroundVideoTrackOptimization);
+  prefs.max_keyframe_distance_to_disable_background_video_sec =
+      variations::GetVariationParamByFeatureAsInt(
+          media::kBackgroundVideoTrackOptimization,
+          "max_keyframe_distance_sec",
+          prefs.max_keyframe_distance_to_disable_background_video_sec);
 
   std::map<std::string, std::string> expensive_background_throttling_prefs;
   variations::GetVariationParamsByFeature(
       features::kExpensiveBackgroundTimerThrottling,
       &expensive_background_throttling_prefs);
   SetFloatParameterFromMap(expensive_background_throttling_prefs, "cpu_budget",
                            &prefs.expensive_background_throttling_cpu_budget);
   SetFloatParameterFromMap(
       expensive_background_throttling_prefs, "initial_budget",
       &prefs.expensive_background_throttling_initial_budget);
@@ skipping 450 matching lines @@
   } else {
     render_view_ready_on_process_launch_ = true;
   }
 }
 
 void RenderViewHostImpl::RenderViewReady() {
   delegate_->RenderViewReady(this);
 }
 
 }  // namespace content