Re-enable the feature that transforms float uniforms to 16 bits Re-enable the feature after suppressing the WebGL conformance tests: https://chromium-review.googlesource.com/c/chromium/src/+/6937051. Temporary disable this feature on PowerVR while the bugs are under investigations. Bug: angleproject:405795981 Bug: angleproject:443302350 Bug: angleproject:443302625 Change-Id: I8263bd6fcf120b7bed8211f0439962be40afd992 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6962958 Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com> Commit-Queue: Yuxin Hu <yuxinhu@google.com>