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

media/blink/webmediaplayer_impl_unittest.cc

Index: media/blink/webmediaplayer_impl_unittest.cc
diff --git a/media/blink/webmediaplayer_impl_unittest.cc b/media/blink/webmediaplayer_impl_unittest.cc
index b68bba6eb50b7cf8e1e850729b78e7ae0e0c5b92..2071eed5003cedb227b2b6e44cdff944a8b7af41 100644
--- a/media/blink/webmediaplayer_impl_unittest.cc
+++ b/media/blink/webmediaplayer_impl_unittest.cc
@@ -208,7 +208,8 @@ class WebMediaPlayerImplTest : public testing::Test {
             scoped_refptr<SwitchableAudioRendererSink>(), media_log_,
             media_thread_.task_runner(), message_loop_.task_runner(),
             message_loop_.task_runner(), WebMediaPlayerParams::Context3DCB(),
-            base::Bind(&OnAdjustAllocatedMemory), nullptr, nullptr, nullptr)));
+            base::Bind(&OnAdjustAllocatedMemory), nullptr, nullptr, nullptr,
+            base::TimeDelta::FromSeconds(10))));
   }
 
   ~WebMediaPlayerImplTest() override {