arturovt 228b5f73b1 fix(platform-browser): ensure that Hammer loader is called only once (#40911)
Currently, the function that is provided through `HAMMER_LOADER` is called the
same number of times as the `HammerGesturesPlugin.addEventListener` method is called
(until the Hammer is loaded).

This commit adds a class property in which the loader call is saved, thereby
preventing multiple calls to the loader function.

PR Close #25995

PR Close #40911
2021-02-19 09:08:34 -08:00
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