commit 89714ce0759dabe11b53495c77ef164c6de1c677
author Andrey Epin <ayepin@google.com> Tue May 16 15:22:32 2023 -0700
committer Andrey Epin <ayepin@google.com> Wed May 17 10:14:38 2023 -0700
tree 864a1e14cfe287748b7238bd0f511510635060d9
parent 85c9dc5d8f61c96d01d5156a7eb9e81d4a781e7c

Limit the number of parallel preview loadings in the image preview loader.

With ag/23192997 the preview cache size effectively increased the total
number of parallel image requests to a large enough value to DDoS Files
app's content provider i.e. when sharing a large number of images, cache
pre-population requests overlap with the actual preview loadings and
causing some of them to fail to load.

Update ImagePreviewImageLoader to use a Semaphore to limit the total
number of parallel preview loadings.

Fix: 283000541
Test: manual testing
Change-Id: I6152f6e589a8b36a4810d617633017b72202e66f