* Hook up PersistentCache to ShellTestPlatformViewVulkan
* [vulkan][fuchsia] enable vulkan without swiftshader in fuchsia tests on arm64
* [vulkan][fuchsia] Disable second half of ShellTest.CacheSkSLWorks on
vulkan backend
GrContext::precompileShader() is not implemented for vulkan contexts, so
dont run the portion of this test that depends on that behavior on
Vulkan.
Co-authored-by: George Wright <gw280@google.com>