[wasm] Add test for wasm streaming compilation URL

Test that the script URL reported by the debugger is the same as the
Response URL passed to the streaming compilation API.

R=bmeurer@chromium.org

Bug: v8:10172
Change-Id: Ifaf8bcdd91df4104527e61b8c7e7b40bfe9eb63b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2064388
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743090}

third_party/blink/web_tests/inspector-protocol/debugger/wasm-streaming-url-expected.txt

+Test script URL for wasm streaming compilation.
+Did enable debugger
+Instantiating.
+Waiting for wasm script
+URL is preserved: true
+

third_party/blink/web_tests/inspector-protocol/debugger/wasm-streaming-url.js

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+function instantiate() {
+  const magicModuleHeader = [0x00, 0x61, 0x73, 0x6d], moduleVersion = [0x01, 0x00, 0x00, 0x00];
+  const wasm = Uint8Array.from([...magicModuleHeader, ...moduleVersion]);
+  let b = new Blob([wasm.buffer], {type: 'application/wasm'});
+  let bURL =  URL.createObjectURL(b);
+  fetch(bURL)
+  .then(WebAssembly.instantiateStreaming)
+  .catch(console.error);
+  return bURL.toString();
+}
+
+(async function(testRunner) {
+  const {page, session, dp} = await testRunner.startBlank(
+      'Test script URL for wasm streaming compilation.');
+
+  await dp.Debugger.enable();
+  testRunner.log('Did enable debugger');
+
+  testRunner.log('Instantiating.');
+  var response = await dp.Runtime
+      .evaluate({expression: '(' + instantiate + ')()'});
+  testRunner.log('Waiting for wasm script');
+  const {params: wasm_script} = await dp.Debugger.onceScriptParsed();
+
+  testRunner.log('URL is preserved: ' + (wasm_script.url == response.result.result.value));
+  testRunner.completeTest();
+})