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Notifies All Apps header when profile tab switches.
This fixes scroll listeners which control the header from Taskbar. In other instances of the All Apps container (i.e. from Launcher), the search bar indirectly updates the header because resetSearch is called, which also resets the header. Separately, I would like to clean that up so that AllAppsContainerView does not get controlled by the search bar (maybe as part of a larger reset cleanup). Fix: 236812759 Test: Manual on device with Taskbar Change-Id: I9921e89c87d5e18e4b28854fbb373f24b4189014