[Video] Disable bg optimization if avg keyframe distance is >10s

media/blink/webmediaplayer_impl.h

Index: media/blink/webmediaplayer_impl.h
diff --git a/media/blink/webmediaplayer_impl.h b/media/blink/webmediaplayer_impl.h
index ac80c099c3ec0199b182fdce94cd6a6867b32c6b..0fa2fc48dfe2a87ad5bfa8c145971adb52c1a45f 100644
--- a/media/blink/webmediaplayer_impl.h
+++ b/media/blink/webmediaplayer_impl.h
@@ -19,6 +19,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread.h"
 #include "base/time/default_tick_clock.h"
+#include "base/time/time.h"
 #include "base/timer/elapsed_timer.h"
 #include "base/timer/timer.h"
 #include "build/build_config.h"
@@ -371,6 +372,10 @@ class MEDIA_BLINK_EXPORT WebMediaPlayerImpl
   // Whether the media should be paused when hidden.
   bool ShouldPauseWhenHidden() const;
 
+  // Whether the video should recover fast when shown if decoding was disabled
+  // in the background.
+  bool ShouldDecodeFastWhenShown() const;
+
   blink::WebLocalFrame* frame_;
 
   // The playback state last reported to |delegate_|, to avoid setting duplicate
@@ -599,6 +604,12 @@ class MEDIA_BLINK_EXPORT WebMediaPlayerImpl
   // Whether the player is currently in autoplay muted state.
   bool autoplay_muted_ = false;
 
+  // The maximum video keyframe distance that allows triggering background
+  // playback optimizations.
+  // 10 seconds by default but can be overridden by a Finch experiment.
+  base::TimeDelta max_keyframe_distance_for_fast_decode_ =
+      base::TimeDelta::FromSeconds(10);
+
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };