Merge commit 'e959e4a0' into lmp-dev

        public void waitForAllWindowsDrawn(Runnable callback, long timeout) {

            synchronized (mWindowMap) {

                mWaitingForDrawnCallback = callback;

                for (int displayNdx = mDisplayContents.size() - 1; displayNdx >= 0; --displayNdx) {

                    final WindowList windows =

                            mDisplayContents.valueAt(displayNdx).getWindowList();

                final WindowList windows = getDefaultWindowListLocked();

                for (int winNdx = windows.size() - 1; winNdx >= 0; --winNdx) {

                    final WindowState win = windows.get(winNdx);

                        if (win.mHasSurface && win.isWinVisibleLw() && !win.mIsWallpaper) {

                    if (win.mHasSurface) {

                        win.mWinAnimator.mDrawState = WindowStateAnimator.DRAW_PENDING;

                        // Force add to mResizingWindows.

                        win.mLastContentInsets.set(-1, -1, -1, -1);

                        mWaitingForDrawn.add(win);

                    }

                }

                }

                requestTraversalLocked();

            }

            mH.removeMessages(H.WAITING_FOR_DRAWN_TIMEOUT);