[js/webgpu] set query type in onRunStart (microsoft#19202)

### Description
<!-- Describe your changes. -->
`env.webgpu.profiling` is a global flag. It may change before each
session.run. So the best place is to update it in `onRunStart` event.
After this, we can directly check `this.queryType`'s value. Without this
pr, we need to make sure that `getCommandEncoder()` is called before
checking `this.queryType`. Otherwise, it may happen that
`pendingKernels`'s length is not equal to `pendingDispatchNumber`'s
length. See the two ugly workarounds
[1)](microsoft@e630dbf#diff-006fc84d3997f96a29b8033bd2075d6a0a9509211bd5812a6b934fc74fedfd9dR267-R268)
and
[2)](microsoft@e630dbf#diff-618fe297fbe7a1da586380163b8fd2627311ccc217640a3c5cdc9c17a33472c1R73-R80)
if we don't introduce `onRunStart`. Or we need to call `setQueryType` in
each kernel run.

web/lib/wasm/binding/ort-wasm.d.ts

@@ -182,6 +182,10 @@ export interface OrtWasmModule extends EmscriptenModule {
   jsepCreateDownloader:
       (gpuBuffer: GPUBuffer, size: number,
        type: Tensor.GpuBufferDataTypes) => () => Promise<Tensor.DataTypeMap[Tensor.GpuBufferDataTypes]>;
+  /**
+   *  [exported from js_internal_api.js] Called when InferenceSession.run started.
+   */
+  jsepOnRunStart: () => void;
   // #endregion
 }
 

web/lib/wasm/jsep/backend-webgpu.ts

@@ -208,7 +208,7 @@ export class WebGpuBackend {
 
     Object.defineProperty(this.env.webgpu, 'device', {value: this.device});
 
-    // init queryType, which is necessary for createKernel
+    // init queryType, which is necessary for InferenceSession.create
     this.setQueryType();
   }
 
@@ -223,8 +223,6 @@ export class WebGpuBackend {
     if (!this.commandEncoder) {
       this.commandEncoder = this.device.createCommandEncoder();
 
-      // refresh queryType, as sometimes we only need to enable query for a specific run
-      this.setQueryType();
       if (this.queryType !== 'none' && typeof this.querySet === 'undefined') {
         this.querySet = this.device.createQuerySet({
           type: 'timestamp',
@@ -639,6 +637,7 @@ export class WebGpuBackend {
       return createView(data.buffer, type);
     };
   }
+  // #endregion
   writeTimestamp(index: number): void {
     if (this.queryType !== 'inside-passes') {
       return;
@@ -657,5 +656,7 @@ export class WebGpuBackend {
       }
     }
   }
-  // #endregion
+  onRunStart(): void {
+    this.setQueryType();
+  }
 }

web/lib/wasm/wasm-core-impl.ts

@@ -488,8 +488,8 @@ export const run = async(
       }
     }
 
+    wasm.jsepOnRunStart?.();
     let errorCode: number;
-
     if (!BUILD_DEFS.DISABLE_WEBGPU && ioBindingState) {
       errorCode = await wasm._OrtRunWithBinding(
           sessionHandle, ioBindingState.handle, outputCount, outputValuesOffset, runOptionsHandle);