inspector: allow es6 module liveedit

After total liveedit rewrite, liveedit works with module, we can remove
the guard.

[email protected]

Bug: chromium:806261
Cq-Include-Trybots: luci.chromium.try:linux_chromium_headless_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ide15eca2ab6d8ba7df4e7fae541c4a65794eeea8
Reviewed-on: https://chromium-review.googlesource.com/1238914
Reviewed-by: Dmitry Gozman <[email protected]>
Commit-Queue: Aleksey Kozyatinskiy <[email protected]>
Cr-Commit-Position: refs/heads/master@{#56151}

src/inspector/v8-debugger-agent-impl.cc

@@ -858,10 +858,6 @@ Response V8DebuggerAgentImpl::setScriptSource(
   if (it == m_scripts.end()) {
     return Response::Error("No script with given id found");
   }
-  if (it->second->isModule()) {
-    // TODO(kozyatinskiy): LiveEdit should support ES6 module
-    return Response::Error("Editing module's script is not supported.");
-  }
   int contextId = it->second->executionContextId();
   InspectedContext* inspected = m_inspector->getContext(contextId);
   if (!inspected) {

src/inspector/v8-debugger-script.cc

@@ -160,7 +160,6 @@ class ActualScript : public V8DebuggerScript {
 
   void setSource(const String16& newSource, bool preview,
                  v8::debug::LiveEditResult* result) override {
-    DCHECK(!isModule());
     v8::EscapableHandleScope scope(m_isolate);
     v8::Local<v8::String> v8Source = toV8String(m_isolate, newSource);
     if (!m_script.Get(m_isolate)->SetScriptSource(v8Source, preview, result)) {

test/inspector/debugger/es6-module-liveedit-expected.txt

@@ -0,0 +1,17 @@
+Checks liveedit with ES6 modules.
+console.log message from function before patching:
+{
+    type : string
+    value : module1
+}
+Debugger.setScriptSource result:
+{
+    callFrames : [
+    ]
+    stackChanged : false
+}
+console.log message from function after patching:
+{
+    type : string
+    value : patched module1
+}

test/inspector/debugger/es6-module-liveedit.js

@@ -0,0 +1,50 @@
+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+const {session, contextGroup, Protocol} =
+    InspectorTest.start('Checks liveedit with ES6 modules.');
+
+const moduleSource = `
+export function foo() {
+  console.log('module1');
+  return 42;
+}
+foo()`;
+
+const newModuleSource = `
+export function foo() {
+  console.log('patched module1');
+  return 42;
+}
+foo()`;
+
+const callFooSource = `
+import { foo } from 'module';
+foo();`;
+
+(async function test() {
+  await Protocol.Runtime.enable();
+  await Protocol.Debugger.enable();
+  contextGroup.addModule(moduleSource, 'module');
+  const [{ params: { scriptId } }, { params: { args }}] = [
+    await Protocol.Debugger.onceScriptParsed(),
+    await Protocol.Runtime.onceConsoleAPICalled()
+  ];
+  InspectorTest.log('console.log message from function before patching:')
+  InspectorTest.logMessage(args[0]);
+
+  const {result} = await Protocol.Debugger.setScriptSource({
+    scriptId,
+    scriptSource: newModuleSource
+  });
+  InspectorTest.log('Debugger.setScriptSource result:');
+  InspectorTest.logMessage(result);
+
+  contextGroup.addModule(callFooSource, 'callFoo');
+  const { params: {args: patchedArgs } } =
+      await Protocol.Runtime.onceConsoleAPICalled();
+  InspectorTest.log('console.log message from function after patching:')
+  InspectorTest.logMessage(patchedArgs[0]);
+  InspectorTest.completeTest();
+})()