Merge "Fix multi-window enter animation" into nyc-dev

        int position = DockedDividerUtils.calculatePositionForBounds(event.initialRect,

                mDockSide, mDividerSize);

        mEntranceAnimationRunning = true;

        // Insets might not have been fetched yet, so fetch manually if needed.

        if (mStableInsets.isEmpty()) {

            SystemServicesProxy.getInstance(mContext).getStableInsets(mStableInsets);

            mSnapAlgorithm = null;

            initializeSnapAlgorithm();

        }

        resizeStack(position, mSnapAlgorithm.getMiddleTarget().position,

                mSnapAlgorithm.getMiddleTarget());

    }