[wasm] Compile closer to how customers will.

third_party/WebKit/LayoutTests/fast/wasm/wasm-limits-tests.js

 // Copyright 2017 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.
 
 var limit = Math.pow(2, 12);
 
 function NoParameters() {
   function ExpectTypeError(f) {
     try {
       f();
@@ skipping 75 matching lines @@
 function TestPromiseCompileAsyncInstantiateFromModule() {
   return WebAssembly.compile(createTestBuffers(limit).large)
     .then(m => {
       assert_true(m instanceof WebAssembly.Module);
       return WebAssembly.instantiate(m).
         then(i => assert_true(i instanceof WebAssembly.Instance),
              assert_unreached);
     },
     assert_unreached);
 }
+
+
+function TestCompileFromPromise() {
+  return Promise.resolve(createTestBuffers(limit).large)
+    .then(WebAssembly.compile)
+    .then(m => assert_true(m instanceof WebAssembly.Module))
+}
+
+function TestInstantiateFromPromise() {
+  return Promise.resolve(createTestBuffers(limit).large)
+    .then(WebAssembly.instantiate)
+    .then(pair => {
+      assert_true(pair.module instanceof WebAssembly.Module);
+      assert_true(pair.instance instanceof WebAssembly.Instance);
+    });
+}
+
+function TestInstantiateFromPromiseChain() {
+  return Promise.resolve(createTestBuffers(limit).large)
+    .then(WebAssembly.compile)
+    .then(WebAssembly.instantiate)
+    .then(i => assert_true(i instanceof WebAssembly.Instance))
+}