webnn: Fix WPT data type compatibility matching for constants

The existing code assumes that the supported data types for the
input() and constant() methods are the same. This is not true on
some platforms

Cq-Include-Trybots: luci.chromium.try:win11-blink-rel,mac14-blink-rel,mac14.arm64-blink-rel
Change-Id: Id0365b623500f9bdb815e3332c3e9cfe4689bf11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6064547
Auto-Submit: Austin Sullivan <[email protected]>
Commit-Queue: Phillis Tang <[email protected]>
Reviewed-by: Phillis Tang <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1391227}

Author: a-sully

webnn/resources/utils.js

@@ -440,11 +440,14 @@ const createOperand = (context, builder, operandName, resources) => {
   const descriptor = resources.descriptor;
   const dataType = descriptor.dataType;
 
+  const supportedDataTypes = resources.constant ?
+      context.opSupportLimits().constant.dataTypes :
+      context.opSupportLimits().input.dataTypes;
+
   // If input data type is not supported on current platform, attempt to use
   // a supported type to pass the data, then cast back to original type.
-  if (!context.opSupportLimits().input.dataTypes.includes(dataType)) {
-    const compatibleType =
-        findCompatibleType(dataType, context.opSupportLimits().input.dataTypes);
+  if (!supportedDataTypes.includes(dataType)) {
+    const compatibleType = findCompatibleType(dataType, supportedDataTypes);
     if (compatibleType) {
       descriptor.castedType = compatibleType;
       descriptor.dataType = compatibleType;