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We added a source that allows mixed placeholder and non-placeholder periods, but have no way to denote that in the Timeline because the placeholder flag only exists on Window level. This causes a bug if the first item in a concatenation has a window-period offset and the player can't detect whether it's still a placeholder or not. Adding this flag to Period allows the player to detect this reliably. In addition we need to make sure that re-resolving pending positions only happens for the first placeholder period where the window-offset can actually change. As all subsequent periods have to start at position 0, so they don't need to be re-resolved (and shouldn't). PiperOrigin-RevId: 367171518