Ground Overlay Manager
Keeps track of collections of ground overlays on the map. Delegates all GroundOverlay-related events to each collection's individually managed listeners.
All ground overlay operations (adds and removes) should occur via its collection class. That is, don't add a ground overlay via a collection, then remove it via GroundOverlay.remove()
Functions
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Gets a named collection that was created by newCollection
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Create a new named collection, which can later be looked up by getCollection
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