[WebNN] Enable npm Unit tests

- Support more test cases for WebNN EP in suite-test-list.jsonc
- Add DISABLE_WEBNN flag in build.ts as preparing for WebNN EP release
- Add test option: '--webnn-device-type' in test-runner-args-cli.ts to support running WebNN 'gpu' deviceType
- Use Chrome Stable as default browser for WebNN testing to unblock the CI limitation.

js/web/lib/build-def.d.ts

@@ -18,6 +18,10 @@ interface BuildDefinitions {
    * defines whether to disable the whole WebGpu backend in the build.
    */
   readonly DISABLE_WEBGPU: boolean;
+  /**
+   * defines whether to disable the whole WebNN backend in the build.
+   */
+  readonly DISABLE_WEBNN: boolean;
   /**
    * defines whether to disable the whole WebAssembly backend in the build.
    */

js/web/lib/index.ts

@@ -28,7 +28,9 @@ if (!BUILD_DEFS.DISABLE_WASM) {
   registerBackend('wasm', wasmBackend, 10);
   if (BUILD_DEFS.DISABLE_TRAINING) {
     registerBackend('xnnpack', wasmBackend, 9);
-    registerBackend('webnn', wasmBackend, 9);
+    if (!BUILD_DEFS.DISABLE_WEBNN) {
+      registerBackend('webnn', wasmBackend, 9);
+    }
   }
 }
 

js/web/script/build.ts

@@ -44,6 +44,7 @@ const SOURCE_ROOT_FOLDER = path.join(__dirname, '../..');  // <ORT_ROOT>/js/
 const DEFAULT_DEFINE = {
   'BUILD_DEFS.DISABLE_WEBGL': 'false',
   'BUILD_DEFS.DISABLE_WEBGPU': 'false',
+  'BUILD_DEFS.DISABLE_WEBNN': 'true',  // Disable WebNN until CI is ready.
   'BUILD_DEFS.DISABLE_WASM': 'false',
   'BUILD_DEFS.DISABLE_WASM_PROXY': 'false',
   'BUILD_DEFS.DISABLE_WASM_THREAD': 'false',
@@ -370,6 +371,7 @@ async function main() {
     await addBuildTask(buildOrt({
       outputBundleName: 'ort.all',
       format: 'iife',
+      define: {...DEFAULT_DEFINE, 'BUILD_DEFS.DISABLE_WEBNN': 'false'}
     }));
   }
 

js/web/script/test-runner-cli-args.ts

@@ -79,6 +79,7 @@ Options:
  --webgl-texture-cache-mode    Set the WebGL texture cache mode (initializerOnly/full)
  --webgl-texture-pack-mode     Set the WebGL texture pack mode (true/false)
  --webgpu-profiling-mode       Set the WebGPU profiling mode (off/default)
+ --webnn-device-type           Set the WebNN device type (cpu/gpu)
 
 *** Browser Options ***
 
@@ -174,6 +175,7 @@ export interface TestRunnerCliArgs {
   cudaFlags?: Record<string, unknown>;
   wasmOptions?: InferenceSession.WebAssemblyExecutionProviderOption;
   webglOptions?: InferenceSession.WebGLExecutionProviderOption;
+  webnnOptions?: InferenceSession.WebNNExecutionProviderOption;
   globalEnvFlags?: Test.Options['globalEnvFlags'];
   noSandbox?: boolean;
   chromiumFlags: string[];
@@ -335,6 +337,14 @@ function parseWebgpuFlags(args: minimist.ParsedArgs): Partial<Env.WebGpuFlags> {
   return {profilingMode, validateInputContent};
 }
 
+function parseWebNNOptions(args: minimist.ParsedArgs): InferenceSession.WebNNExecutionProviderOption {
+  const deviceType = args['webnn-device-type'];
+  if (deviceType !== undefined && deviceType !== 'cpu' && deviceType !== 'gpu') {
+    throw new Error('Flag "webnn-device-type" is invalid');
+  }
+  return {name: 'webnn', deviceType};
+}
+
 function parseGlobalEnvFlags(args: minimist.ParsedArgs): NonNullable<TestRunnerCliArgs['globalEnvFlags']> {
   const wasm = parseWasmFlags(args);
   const webgl = parseWebglFlags(args);
@@ -449,6 +459,7 @@ export function parseTestRunnerCliArgs(cmdlineArgs: string[]): TestRunnerCliArgs
   const wasmOptions = parseWasmOptions(args);
 
   const webglOptions = parseWebglOptions(args);
+  const webnnOptions = parseWebNNOptions(args);
 
   // Option: --no-sandbox
   const noSandbox = !!args['no-sandbox'];
@@ -487,6 +498,7 @@ export function parseTestRunnerCliArgs(cmdlineArgs: string[]): TestRunnerCliArgs
     fileCache,
     cpuOptions,
     webglOptions,
+    webnnOptions,
     wasmOptions,
     globalEnvFlags,
     noSandbox,

js/web/script/test-runner-cli.ts

@@ -165,6 +165,7 @@ async function main() {
       debug: args.debug,
       cpuOptions: args.cpuOptions,
       webglOptions: args.webglOptions,
+      webnnOptions: args.webnnOptions,
       wasmOptions: args.wasmOptions,
       globalEnvFlags: args.globalEnvFlags
     }
@@ -499,7 +500,7 @@ async function main() {
           args.bundleMode === 'perf' ? 'perf' :
               args.debug             ? 'debug' :
                                        'test',
-          webgpu, webnn);
+          webgpu);
       const karmaArgs = ['karma', 'start', `--browsers ${browser}`];
       const chromiumFlags = ['--enable-features=SharedArrayBuffer', ...args.chromiumFlags];
       if (args.debug) {
@@ -614,11 +615,10 @@ async function main() {
     fs.writeJSONSync(path.join(TEST_ROOT, './testdata-config.json'), config);
   }
 
-  function getBrowserNameFromEnv(
-      env: TestRunnerCliArgs['env'], mode: 'debug'|'perf'|'test', webgpu: boolean, webnn: boolean) {
+  function getBrowserNameFromEnv(env: TestRunnerCliArgs['env'], mode: 'debug'|'perf'|'test', webgpu: boolean) {
     switch (env) {
       case 'chrome':
-        return selectChromeBrowser(mode, webgpu, webnn);
+        return selectChromeBrowser(mode, webgpu);
       case 'edge':
         return 'EdgeTest';
       case 'firefox':
@@ -634,10 +634,8 @@ async function main() {
     }
   }
 
-  function selectChromeBrowser(mode: 'debug'|'perf'|'test', webgpu: boolean, webnn: boolean) {
-    if (webnn) {
-      return 'ChromeCanaryTest';
-    } else if (webgpu) {
+  function selectChromeBrowser(mode: 'debug'|'perf'|'test', webgpu: boolean) {
+    if (webgpu) {
       return 'ChromeTest';
     } else {
       switch (mode) {