Don't histogram paint time after ending or seeking.

media/blink/webmediaplayer_impl.h

 // Copyright 2013 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.
 
 #ifndef MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 #define MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 694 matching lines @@
   // Whether the video requires a user gesture to resume after it was paused in
   // the background. Affects the value of ShouldPauseVideoWhenHidden().
   bool video_locked_when_paused_when_hidden_ = false;
 
   // Whether embedded media experience is currently enabled.
   bool embedded_media_experience_enabled_ = false;
 
   gfx::Size last_uploaded_frame_size_;
   base::TimeDelta last_uploaded_frame_timestamp_;
 
+  base::CancelableCallback<void(base::TimeTicks)> frame_time_report_cb_;
+
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_