DevTools: introduce object previews experiment

third_party/WebKit/Source/devtools/front_end/components/JavaScriptAutocomplete.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.
 
 Components.JavaScriptAutocomplete = {};
 
 /** @typedef {{title:(string|undefined), items:Array<string>}} */
 Components.JavaScriptAutocomplete.CompletionGroup;
 
 /**
@@ skipping 86 matching lines @@
 
     /**
      * @param {?SDK.RemoteObject} object
      * @return {!Promise<?SDK.RemoteObject>}
      */
     function extractTarget(object) {
       if (!object)
         return Promise.resolve(/** @type {?SDK.RemoteObject} */ (null));
       if (object.type !== 'object' || object.subtype !== 'proxy')
         return Promise.resolve(/** @type {?SDK.RemoteObject} */ (object));
-      return object.getOwnPropertiesPromise().then(extractTargetFromProperties).then(extractTarget);
+      return object.getOwnPropertiesPromise(false /* generatePreview */)
+          .then(extractTargetFromProperties)
+          .then(extractTarget);
     }
 
     /**
      * @param {!{properties: ?Array<!SDK.RemoteObjectProperty>, internalProperties: ?Array<!SDK.RemoteObjectProperty>}} properties
      * @return {?SDK.RemoteObject}
      */
     function extractTargetFromProperties(properties) {
       var internalProperties = properties.internalProperties || [];
       var target = internalProperties.find(property => property.name === '[[Target]]');
       return target ? target.value : null;
@@ skipping 81 matching lines @@
         group.items.push(properties[i].name);
       if (--pendingRequests === 0)
         callback(result);
     }
 
     var scopeChain = callFrame.scopeChain();
     var pendingRequests = scopeChain.length;
     for (var i = 0; i < scopeChain.length; ++i) {
       var scope = scopeChain[i];
       var object = scope.object();
-      object.getAllProperties(false, propertiesCollected.bind(null, scope.typeName()));
+      object.getAllProperties(
+          false /* accessorPropertiesOnly */, false /* generatePreview */,
+          propertiesCollected.bind(null, scope.typeName()));
     }
   }
 
   /**
    * @param {?SDK.RemoteObject} result
    * @param {!Protocol.Runtime.ExceptionDetails=} exceptionDetails
    */
   function receivedPropertyNamesFromEval(result, exceptionDetails) {
     executionContext.target().runtimeAgent().releaseObjectGroup('completion');
     if (result && !exceptionDetails)
@@ skipping 123 matching lines @@
   function itemComparator(a, b) {
     var aStartsWithUnderscore = a.startsWith('_');
     var bStartsWithUnderscore = b.startsWith('_');
     if (aStartsWithUnderscore && !bStartsWithUnderscore)
       return 1;
     if (bStartsWithUnderscore && !aStartsWithUnderscore)
       return -1;
     return String.naturalOrderComparator(a, b);
   }
 };