chore: import upstream snapshot with attribution

static/js/scripts/package/browser/core.js

@@ -0,0 +1,21 @@
+/**
+ * @license
+ * Copyright 2019 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @fileoverview Blockly core module for the browser. It includes blockly.js
+ *               and adds a helper method for setting the locale.
+ */
+
+/* eslint-disable */
+'use strict';
+
+// Add a helper method to set the Blockly locale.
+Blockly.setLocale = function (locale) {
+  Blockly.Msg = Blockly.Msg || {};
+  Object.keys(locale).forEach(function (k) {
+    Blockly.Msg[k] = locale[k];
+  });
+};

static/js/scripts/package/browser/index.js

@@ -0,0 +1,24 @@
+/**
+ * @license
+ * Copyright 2019 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @fileoverview Blockly module for the browser. This includes Blockly core
+ * and built in blocks, the JavaScript code generator and the English block
+ * localization files.
+ */
+
+/* eslint-disable */
+'use strict';
+
+// Include the EN Locale by default.
+Blockly.setLocale(En);
+
+Blockly.Blocks = Blockly.Blocks || {};
+Object.keys(BlocklyBlocks).forEach(function (k) {
+  Blockly.Blocks[k] = BlocklyBlocks[k];
+});
+
+Blockly.JavaScript = BlocklyJS;