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Make WindowState use config from WindowContainer
Previously WindowState updated its config only when it was either requested to relayout the window or to report resize to client. This CL makes WindowState to use WindowContainer's configuration handling model. Configuration can be updated any time by parent window container or any other caller. Also we're saving last reported to client config to be able to check if there is something new since last report. Test: Manual and existing tests still pass. Change-Id: I832acdb950871b85b7c16becde16d58de392faf5