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

content/public/common/web_preferences.h

Index: content/public/common/web_preferences.h
diff --git a/content/public/common/web_preferences.h b/content/public/common/web_preferences.h
index 4835144f9ff454ad268b1b4c5ec085257bcdf805..62fd756ed1514a0fceda77c3210be6f92b1b2271 100644
--- a/content/public/common/web_preferences.h
+++ b/content/public/common/web_preferences.h
@@ -263,6 +263,10 @@ struct CONTENT_EXPORT WebPreferences {
 
   // If enabled, disabled video track when the video is in the background.
   bool background_video_track_optimization_enabled;
+  // If background video track optimization is enabled, don't disable video

[nasko, 2017/01/13 16:30:04]

nit: Keep the the style of the file and put an empty line above the comment.

[whywhat, 2017/01/13 21:10:54]

Done.

+  // track for videos with the average keyframe distance greater than this
+  // value (in seconds).
+  int max_keyframe_distance_to_disable_background_video_sec;

[DaleCurtis, 2017/01/13 20:34:13]

base::TimeDelta?

[whywhat, 2017/01/13 21:10:54]

Hm, I've no idea if the IPC macros will handle anything that's not a primitive
type or a string. Will try :)

 
   // Whether it is a presentation receiver.
   bool presentation_receiver;