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Valentin Shergin
69f9fd4f96
Summary: This diff contains some small improvements in `ImageResponseObserverCoordinator` which are pretty minor: * Now we use `small_vector` instead of a normal one. In the vast majority of cases, the coordinator has only one observer, so having `small_vector` with default size `1` saves us a memory allocation (which is a dozen of allocations for a screen, not bad). * Empty constructor and destructor were removed. * Unnecessary copying of ImageResponse was removed. ImageResponse is a practically a shared_pointer, it has value semantic and does not need to be copied. We don't need to acquire mutex to access that. Reviewed By: sammy-SC Differential Revision: D17368740 fbshipit-source-id: 828e27a72b9c8ac0063c5fbda00f83ddb255309c