DevTools: Use CodeMirror syntax highlighting to improve JS autocomplete

third_party/WebKit/Source/devtools/front_end/console/ConsolePrompt.js

 // Copyright 2016 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.
 /**
  * @unrestricted
  */
 WebInspector.ConsolePrompt = class extends WebInspector.Widget {
   constructor() {
     super();
     this._addCompletionsFromHistory = true;
@@ skipping 234 matching lines @@
       if (' =:[({;,!+-*/&|^<>.'.indexOf(lineText.charAt(index)) !== -1)
         break;
     }
     return new WebInspector.TextRange(lineNumber, index + 1, lineNumber, columnNumber);
   }
 
   /**
    * @param {!WebInspector.TextRange} queryRange
    * @param {!WebInspector.TextRange} substituteRange
    * @param {boolean=} force
+   * @param {string=} currentTokenType
    * @return {!Promise<!WebInspector.SuggestBox.Suggestions>}
    */
-  _wordsWithQuery(queryRange, substituteRange, force) {
+  _wordsWithQuery(queryRange, substituteRange, force, currentTokenType) {
     var query = this._editor.text(queryRange);
     var before = this._editor.text(new WebInspector.TextRange(0, 0, queryRange.startLine, queryRange.startColumn));
     var historyWords = this._historyCompletions(query, force);
+
+    var excludedTokens = new Set(['js-comment', 'js-string-2']);
+    if (!before.endsWith('['))
+      excludedTokens.add('js-string');
+    if (excludedTokens.has(currentTokenType))
+      return Promise.resolve(historyWords);
+
     return WebInspector.JavaScriptAutocomplete.completionsForTextInCurrentContext(before, query, force)
         .then(innerWordsWithQuery);
     /**
      * @param {!Array<string>} words
      * @return {!WebInspector.SuggestBox.Suggestions}
      */
     function innerWordsWithQuery(words) {
       return words.map(item => ({title: item})).concat(historyWords);
     }
   }
@@ skipping 84 matching lines @@
     return this._currentHistoryItem();
   }
 
   /**
    * @return {string|undefined}
    */
   _currentHistoryItem() {
     return this._data[this._data.length - this._historyOffset];
   }
 };