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

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 11e7198d70cf15b155ba0bac452aacadb0a4cd91..3400dbd15c31eab13aeb3e768c535a9a73508774 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -2840,7 +2840,10 @@ blink::WebMediaPlayer* RenderFrameImpl::createMediaPlayer(
       render_thread->compositor_task_runner(), context_3d_cb,
       base::Bind(&v8::Isolate::AdjustAmountOfExternalAllocatedMemory,
                  base::Unretained(blink::mainThreadIsolate())),
-      initial_cdm, media_surface_manager_, media_observer);
+      initial_cdm, media_surface_manager_, media_observer,
+      // TODO(avayvod, asvitkine): Query the value directly when it is available
+      // in the renderer process. See https://crbug.com/681160.
+      GetWebkitPreferences().max_keyframe_distance_to_disable_background_video);
 
   bool use_fallback_path = false;
 #if defined(OS_ANDROID)