Vulkan validation layers source code

[Shanfeng Cheng]

I upgraded to m57 today and tried to build. Got the following error about the source code for Vulkan validation layers missing:

ninja: error: '../../third_party/vulkan-validation-layers/src/loader/cJSON.c', needed by 'obj/third_party/angle/src/vulkan_support/vulkan_loader/cJSON.obj', missing and no known rule to make it

I only saw README.chromium file under the vulkan-validation-layers folder. I saw a git url in it and cloned the git repository. However, I got the following error after that:

ninja: error: '../../third_party/vulkan-validation-layers/src/loader/extensions.c', needed by 'obj/third_party/angle/src/vulkan_support/vulkan_loader/extensions.obj', missing and no known rule to make it

Are we supposed to fetch the source code for  Vulkan validation layers manually? Why is it not part of the gclient sync opertaion?

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Shanfeng Cheng