This will help gauge Shaderc usage.
<id value="10" vendor="AMD" comment="Contact Daniel Rakos, daniel.rakos@amd.com"/>
<id value="11" vendor="Intel" comment="Contact Alexey, alexey.bader@intel.com"/>
<id value="12" vendor="Imagination" comment="Contact James Jones"/>
- <unused start="13" end="0xFFFF" comment="Tool ID range reservable for future use by vendors"/>
+ <id value="13" vendor="Google" tool="Shaderc over Glslang" comment="Contact David Neto, dneto@google.com"/>
+ <unused start="14" end="0xFFFF" comment="Tool ID range reservable for future use by vendors"/>
</ids>
<!-- SECTION: SPIR-V Opcodes and Enumerants -->