Add config change support to FFmpegVideoDecoder

media/filters/video_renderer_base.cc

Index: media/filters/video_renderer_base.cc
diff --git a/media/filters/video_renderer_base.cc b/media/filters/video_renderer_base.cc
index 8451201fae668bd916c1c86bb853bf48e6c9883b..640a7d755100a5863c44334e82dcde664e232489 100644
--- a/media/filters/video_renderer_base.cc
+++ b/media/filters/video_renderer_base.cc
@@ -284,13 +284,22 @@ void VideoRendererBase::ThreadMain() {
       continue;
     }
 
-
     // Congratulations! You've made it past the video frame timing gauntlet.
     //
     // We can now safely update the current frame, request another frame, and
     // signal to the client that a new frame is available.
     DCHECK(!pending_paint_);
     DCHECK(!ready_frames_.empty());
+
+    size_t new_width = ready_frames_.front()->natural_width();
+    size_t new_height = ready_frames_.front()->natural_height();
+
+    if (!current_frame_ ||
+        current_frame_->natural_width() != new_width ||
+        current_frame_->natural_height() != new_height) {
+      host_->SetNaturalVideoSize(gfx::Size(new_width, new_height));
+    }
+
     current_frame_ = ready_frames_.front();
     ready_frames_.pop_front();
     AttemptRead_Locked();