Merge "Do not draw snapshot starting window if can't get a valid Canvas." into main

                        PixelFormat.RGBA_8888,

                        GraphicBuffer.USAGE_HW_TEXTURE | GraphicBuffer.USAGE_HW_COMPOSER

                                | GraphicBuffer.USAGE_SW_WRITE_RARELY);

                if (background == null) {

                final Canvas c = background != null ? background.lockCanvas() : null;

                if (c == null) {

                    Log.e(TAG, "Unable to draw snapshot: failed to allocate graphic buffer for "

                            + mTitle);

                    mTransaction.clear();

                    childSurfaceControl.release();

                    return;

                }

                // TODO: Support this on HardwareBuffer

                final Canvas c = background.lockCanvas();

                drawBackgroundAndBars(c, frame);

                background.unlockCanvasAndPost(c);

                mTransaction.setBuffer(mRootSurface,