WebGPU: roll header and generated changes in from Dawn

Rolls to dawn revision:
https://dawn.googlesource.com/dawn/+log/ad853f80af9b236fa3aa6be6dcd2facb26430565
and fixes library_webgpu.js where necessary.

Also adds several files to match Dawn, so that Emscripten mirrors Dawn's
generated files directly, requiring less manual intervention.

Author: kainino0x

src/generated_struct_info32.json

@@ -842,6 +842,13 @@
             "size": 16,
             "usage": 8
         },
+        "WGPUBufferMapCallbackInfo": {
+            "__size__": 16,
+            "callback": 8,
+            "mode": 4,
+            "nextInChain": 0,
+            "userdata": 12
+        },
         "WGPUChainedStruct": {
             "__size__": 8,
             "next": 0,
@@ -936,8 +943,8 @@
             "deviceLostUserdata": 32,
             "label": 4,
             "nextInChain": 0,
+            "requiredFeatureCount": 8,
             "requiredFeatures": 12,
-            "requiredFeaturesCount": 8,
             "requiredLimits": 16
         },
         "WGPUExtent3D": {
@@ -956,6 +963,15 @@
             "targetCount": 20,
             "targets": 24
         },
+        "WGPUFuture": {
+            "__size__": 8,
+            "id": 0
+        },
+        "WGPUFutureWaitInfo": {
+            "__size__": 16,
+            "completed": 8,
+            "future": 0
+        },
         "WGPUImageCopyBuffer": {
             "__size__": 40,
             "buffer": 32,
@@ -971,9 +987,16 @@
             "texture": 4
         },
         "WGPUInstanceDescriptor": {
-            "__size__": 4,
+            "__size__": 16,
+            "features": 4,
             "nextInChain": 0
         },
+        "WGPUInstanceFeatures": {
+            "__size__": 12,
+            "nextInChain": 0,
+            "timedWaitAnyEnable": 4,
+            "timedWaitAnyMaxCount": 8
+        },
         "WGPULimits": {
             "__size__": 144,
             "maxBindGroups": 16,
@@ -1062,21 +1085,28 @@
             "label": 4,
             "nextInChain": 0
         },
+        "WGPUQueueWorkDoneCallbackInfo": {
+            "__size__": 16,
+            "callback": 8,
+            "mode": 4,
+            "nextInChain": 0,
+            "userdata": 12
+        },
         "WGPURenderBundleDescriptor": {
             "__size__": 8,
             "label": 4,
             "nextInChain": 0
         },
         "WGPURenderBundleEncoderDescriptor": {
-            "__size__": 28,
+            "__size__": 32,
+            "colorFormatCount": 8,
             "colorFormats": 12,
-            "colorFormatsCount": 8,
             "depthReadOnly": 24,
             "depthStencilFormat": 16,
             "label": 4,
             "nextInChain": 0,
             "sampleCount": 20,
-            "stencilReadOnly": 25
+            "stencilReadOnly": 28
         },
         "WGPURenderPassColorAttachment": {
             "__size__": 56,
@@ -1132,10 +1162,17 @@
             "primitive": 40,
             "vertex": 12
         },
+        "WGPURequestAdapterCallbackInfo": {
+            "__size__": 16,
+            "callback": 8,
+            "mode": 4,
+            "nextInChain": 0,
+            "userdata": 12
+        },
         "WGPURequestAdapterOptions": {
-            "__size__": 20,
+            "__size__": 24,
             "backendType": 12,
-            "compatibilityMode": 17,
+            "compatibilityMode": 20,
             "compatibleSurface": 4,
             "forceFallbackAdapter": 16,
             "nextInChain": 0,
@@ -1228,6 +1265,11 @@
             "sampleType": 4,
             "viewDimension": 8
         },
+        "WGPUTextureBindingViewDimensionDescriptor": {
+            "__size__": 12,
+            "chain": 0,
+            "textureBindingViewDimension": 8
+        },
         "WGPUTextureDataLayout": {
             "__size__": 24,
             "bytesPerRow": 16,

src/generated_struct_info64.json

@@ -842,6 +842,13 @@
             "size": 24,
             "usage": 16
         },
+        "WGPUBufferMapCallbackInfo": {
+            "__size__": 32,
+            "callback": 16,
+            "mode": 8,
+            "nextInChain": 0,
+            "userdata": 24
+        },
         "WGPUChainedStruct": {
             "__size__": 16,
             "next": 0,
@@ -936,8 +943,8 @@
             "deviceLostUserdata": 64,
             "label": 8,
             "nextInChain": 0,
+            "requiredFeatureCount": 16,
             "requiredFeatures": 24,
-            "requiredFeaturesCount": 16,
             "requiredLimits": 32
         },
         "WGPUExtent3D": {
@@ -956,6 +963,15 @@
             "targetCount": 40,
             "targets": 48
         },
+        "WGPUFuture": {
+            "__size__": 8,
+            "id": 0
+        },
+        "WGPUFutureWaitInfo": {
+            "__size__": 16,
+            "completed": 8,
+            "future": 0
+        },
         "WGPUImageCopyBuffer": {
             "__size__": 40,
             "buffer": 32,
@@ -971,9 +987,16 @@
             "texture": 8
         },
         "WGPUInstanceDescriptor": {
-            "__size__": 8,
+            "__size__": 32,
+            "features": 8,
             "nextInChain": 0
         },
+        "WGPUInstanceFeatures": {
+            "__size__": 24,
+            "nextInChain": 0,
+            "timedWaitAnyEnable": 8,
+            "timedWaitAnyMaxCount": 16
+        },
         "WGPULimits": {
             "__size__": 144,
             "maxBindGroups": 16,
@@ -1062,21 +1085,28 @@
             "label": 8,
             "nextInChain": 0
         },
+        "WGPUQueueWorkDoneCallbackInfo": {
+            "__size__": 32,
+            "callback": 16,
+            "mode": 8,
+            "nextInChain": 0,
+            "userdata": 24
+        },
         "WGPURenderBundleDescriptor": {
             "__size__": 16,
             "label": 8,
             "nextInChain": 0
         },
         "WGPURenderBundleEncoderDescriptor": {
             "__size__": 48,
+            "colorFormatCount": 16,
             "colorFormats": 24,
-            "colorFormatsCount": 16,
             "depthReadOnly": 40,
             "depthStencilFormat": 32,
             "label": 8,
             "nextInChain": 0,
             "sampleCount": 36,
-            "stencilReadOnly": 41
+            "stencilReadOnly": 44
         },
         "WGPURenderPassColorAttachment": {
             "__size__": 72,
@@ -1132,10 +1162,17 @@
             "primitive": 80,
             "vertex": 24
         },
+        "WGPURequestAdapterCallbackInfo": {
+            "__size__": 32,
+            "callback": 16,
+            "mode": 8,
+            "nextInChain": 0,
+            "userdata": 24
+        },
         "WGPURequestAdapterOptions": {
             "__size__": 32,
             "backendType": 20,
-            "compatibilityMode": 25,
+            "compatibilityMode": 28,
             "compatibleSurface": 8,
             "forceFallbackAdapter": 24,
             "nextInChain": 0,
@@ -1228,6 +1265,11 @@
             "sampleType": 8,
             "viewDimension": 12
         },
+        "WGPUTextureBindingViewDimensionDescriptor": {
+            "__size__": 24,
+            "chain": 0,
+            "textureBindingViewDimension": 16
+        },
         "WGPUTextureDataLayout": {
             "__size__": 24,
             "bytesPerRow": 16,