Merge "Task thumbnail background is spilling to the front, making the BK 1px...

        // Always draw the background since the snapshots might be translucent or partially empty

        // (For example, tasks been reparented out of dismissing split root when drag-to-dismiss

        // split screen).

        canvas.drawRoundRect(x, y, width, height, cornerRadius, cornerRadius, mBackgroundPaint);

        canvas.drawRoundRect(x, y + 1, width, height - 1, cornerRadius,

                cornerRadius, mBackgroundPaint);

        final boolean drawBackgroundOnly = mTask == null || mTask.isLocked || mBitmapShader == null

                || mThumbnailData == null;