Merge "Prevent SurfaceView flash while resizing."

        // notifying the client to render to with an offset from the surface's top-left.

        if (win.isDragResizeChanged()) {

            win.setDragResizing();

            if (win.mHasSurface) {

            // We can only change top level windows to the full-screen surface when

            // resizing (as we only have one full-screen surface). So there is no need

            // to preserve and destroy windows which are attached to another, they 

            // will keep their surface and its size may change over time.

            if (win.mHasSurface && win.mAttachedWindow == null) {

                winAnimator.preserveSurfaceLocked();

                result |= WindowManagerGlobal.RELAYOUT_RES_FIRST_TIME;

            }

        if (mSurfaceController != null) {

            int i = mWin.mChildWindows.size();

            while (i > 0) {

            // When destroying a surface we want to make sure child windows

            // are hidden. If we are preserving the surface until redraw though

            // we intend to swap it out with another surface for resizing. In this case

            // the window always remains visible to the user and the child windows

            // should likewise remain visable.

            while (!mDestroyPreservedSurfaceUponRedraw && i > 0) {

                i--;

                WindowState c = mWin.mChildWindows.get(i);

                c.mAttachedHidden = true;