Merge "Remove check for new requested sync before flushing shadow queue" into udc-qpr-dev

                // frame numbers that were in a sync. We remove the frame from mSyncedFrameNumbers

                // set and then check if it's empty. If there are no more pending syncs, we can

                // proceed with flushing the shadow queue.

                // We also want to check if mSyncTransaction is null because it's possible another

                // sync request came in while waiting, but it hasn't started processing yet. In that

                // case, we don't actually want to flush the frames in between since they will get

                // processed and merged with the sync transaction and released earlier than if they

                // were sent to SF

                mSyncedFrameNumbers.erase(currFrameNumber);

                if (mSyncedFrameNumbers.empty() && mSyncTransaction == nullptr) {

                if (mSyncedFrameNumbers.empty()) {

                    flushShadowQueue();

                }

            } else {