Move WebGPU Closure Externs to their own file, and update the externs list to the latest WebGPU spec as of 2nd of November 2022. (#18135)

Author: juj

src/closure-externs/closure-externs.js

@@ -261,46 +261,6 @@ var currentFrame;
 var currentTime;
 var sampleRate;
 
-/*
- * WebGPU globals
- */
-var GPUBufferUsage;
-var GPUColorWrite;
-var GPUMapMode;
-var GPUShaderStage;
-var GPUTextureUsage;
-var GPU;
-var GPUAdapter;
-var GPUBindGroup;
-var GPUBindGroupLayout;
-var GPUBuffer;
-var GPUCanvasContext;
-var GPUCommandBuffer;
-var GPUCommandEncoder;
-var GPUCompilationInfo;
-var GPUCompilationMessage;
-var GPUComputePassEncoder;
-var GPUComputePipeline;
-var GPUDevice;
-var GPUDeviceLostInfo;
-var GPUExternalTexture;
-var GPUOutOfMemoryError;
-var GPUPipelineLayout;
-var GPUQuerySet;
-var GPUQueue;
-var GPURenderBundle;
-var GPURenderBundleEncoder;
-var GPURenderPassEncoder;
-var GPURenderPipeline;
-var GPUSampler;
-var GPUShaderModule;
-var GPUSupportedFeatures;
-var GPUSupportedLimits;
-var GPUTexture;
-var GPUTextureView;
-var GPUUncapturedErrorEvent;
-var GPUValidationError;
-
 /*
  * Avoid closure minifying anything to "id". See #13965
  */

src/closure-externs/webgpu-externs.js

@@ -0,0 +1,42 @@
+/*
+ * WebGPU globals
+ */
+var GPU;
+var GPUAdapter;
+var GPUAdapterInfo;
+var GPUBindGroup;
+var GPUBindGroupLayout;
+var GPUBuffer;
+var GPUBufferUsage;
+var GPUCanvasContext;
+var GPUColorWrite;
+var GPUCommandBuffer;
+var GPUCommandEncoder;
+var GPUCompilationInfo;
+var GPUCompilationMessage;
+var GPUComputePassEncoder;
+var GPUComputePipeline;
+var GPUDevice;
+var GPUDeviceLostInfo;
+var GPUError;
+var GPUExternalTexture;
+var GPUInternalError;
+var GPUMapMode;
+var GPUOutOfMemoryError;
+var GPUPipelineLayout;
+var GPUQuerySet;
+var GPUQueue;
+var GPURenderBundle;
+var GPURenderBundleEncoder;
+var GPURenderPassEncoder;
+var GPURenderPipeline;
+var GPUSampler;
+var GPUShaderModule;
+var GPUShaderStage;
+var GPUSupportedFeatures;
+var GPUSupportedLimits;
+var GPUTexture;
+var GPUTextureUsage;
+var GPUTextureView;
+var GPUUncapturedErrorEvent;
+var GPUValidationError;

tools/building.py

@@ -557,6 +557,9 @@ def closure_compiler(filename, pretty, advanced=True, extra_closure_args=None):
   # should not minify these symbol names.
   CLOSURE_EXTERNS = [path_from_root('src/closure-externs/closure-externs.js')]
 
+  if settings.USE_WEBGPU:
+    CLOSURE_EXTERNS += [path_from_root('src/closure-externs/webgpu-externs.js')]
+
   # Closure compiler needs to know about all exports that come from the wasm module, because to optimize for small code size,
   # the exported symbols are added to global scope via a foreach loop in a way that evades Closure's static analysis. With an explicit
   # externs file for the exports, Closure is able to reason about the exports.