Commits on Jun 24, 2019

1. use browser Cache interface to cache tiles (#8363) …

   Recent pricing changes introduced a `sku=` query parameter that changes with every map load. This defeats the browser's ability to cache these tiles. We're working around that by implementing our own caching with the new `Cache` api.
   
   - skips caching tiles that expire soon
   - only caches mapbox tiles (no 3rd party tiles, styles, etc because the browser should cache these fine)
   - does not work in IE, Safari
   
   Browser tests can be found in debug/cache_api.html
   
   mapboxgl.clearStorage added to provide a way to clear the cache.

   

   ansis committed Jun 24, 2019
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2. fix cache support check for enforcing size limit …

   This was throwing errors in browsers that don't support the cache api
   but wasn't previously noticed because it was not breaking anything.

   

   ansis committed Jun 24, 2019
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