Add missing license headers

In a follow-up CL we will be porting the license header check to ESLint.
This allows us to add missing license headers for TypeScript-authored
files. The script found some missing license headers already, which this
CL adds.

Change-Id: Id5041813281d2a7151297f9ed29baabc1cfd85af
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2097991
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
diff --git a/scripts/javascript_natives/index.js b/scripts/javascript_natives/index.js
index 65f4821..3c87be4 100644
--- a/scripts/javascript_natives/index.js
+++ b/scripts/javascript_natives/index.js
@@ -1,3 +1,7 @@
+// 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.
+
 const WebIDL2 = require('webidl2');
 const fs = require('fs');
 const path = require('path');
diff --git a/scripts/json_validator/validate_module_json.js b/scripts/json_validator/validate_module_json.js
index fcb592f..f4175a4 100644
--- a/scripts/json_validator/validate_module_json.js
+++ b/scripts/json_validator/validate_module_json.js
@@ -1,3 +1,7 @@
+// 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.
+
 const fs = require('fs');
 const path = require('path');
 
diff --git a/scripts/localization/check_localizable_resources.js b/scripts/localization/check_localizable_resources.js
index 33750be..dd21e7d 100644
--- a/scripts/localization/check_localizable_resources.js
+++ b/scripts/localization/check_localizable_resources.js
@@ -1,5 +1,4 @@
-// Copyright 2019 The Chromium Authors. All rights reserved.
-// Copyright (C) Microsoft Corporation. All rights reserved.
+// 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.
 
diff --git a/scripts/run_old_devtools/index.js b/scripts/run_old_devtools/index.js
index 04b384d..d98af3e 100644
--- a/scripts/run_old_devtools/index.js
+++ b/scripts/run_old_devtools/index.js
@@ -1,3 +1,7 @@
+// 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.
+
 const path = require('path');
 const puppeteer = require('puppeteer');
 const childProcess = require('child_process');
diff --git a/scripts/unused_css/index.js b/scripts/unused_css/index.js
index 1dc3296..0d7e77b 100644
--- a/scripts/unused_css/index.js
+++ b/scripts/unused_css/index.js
@@ -1,3 +1,7 @@
+// 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.
+
 const fs = require('fs');
 const path = require('path');
 const css = require('css');