Jing Yu

I've encountered the same locking issue. With some investigation, we found that if we try to initialize a `Snapshotter` before a MapView has been initialized, the `Snapshotter` initializer will hang...

We also tried v10.11.1, we got crash in `Snapshotter` too. ``` Crashed: com.mapbox.common.Snapshotter EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000000 0 Metal -[_MTLLibrary newFunctionWithName:constantValues:functionCache:specializedName:error:] + 340 1 MapboxCoreMaps mbgl::metal::createRenderPipeline(mbgl::metal::Context&, char const*, unsigned char, std::__1::vector...