DevTools: do not pro-actively query all StyleSheets for their content.

third_party/WebKit/Source/devtools/front_end/common/StaticContentProvider.js

 // Copyright 2014 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.
 
 /**
  * @constructor
  * @implements {WebInspector.ContentProvider}
  * @param {string} contentURL
  * @param {!WebInspector.ResourceType} contentType
- * @param {!Promise<string>} contentGetter
+ * @param {function():!Promise<string>} lazyContent
  */
-WebInspector.StaticContentProvider = function(contentURL, contentType, contentGetter)
+WebInspector.StaticContentProvider = function(contentURL, contentType, lazyContent)
 {
     this._contentURL = contentURL;
     this._contentType = contentType;
-    this._contentGetter = contentGetter;
+    this._lazyContent = lazyContent;
+}
+
+/**
+ * @param {string} contentURL
+ * @param {!WebInspector.ResourceType} contentType
+ * @param {string} content
+ * @return {!WebInspector.StaticContentProvider}
+ */
+WebInspector.StaticContentProvider.fromString = function(contentURL, contentType, content)
+{
+    var lazyContent = () => Promise.resolve(content);

[dgozman, 2016/05/11 18:09:21]

This looks hilarious.

+    return new WebInspector.StaticContentProvider(contentURL, contentType, lazyContent);
 }
 
 WebInspector.StaticContentProvider.prototype = {
     /**
      * @override
      * @return {string}
      */
     contentURL: function()
     {
         return this._contentURL;
     },
 
     /**
      * @override
      * @return {!WebInspector.ResourceType}
      */
     contentType: function()
     {
         return this._contentType;
     },
 
     /**
      * @override
      * @return {!Promise<?string>}
      */
     requestContent: function()
     {
-        return /** @type {!Promise<?string>} */(this._contentGetter);
+        return /** @type {!Promise<?string>} */(this._lazyContent());
     },
 
     /**
      * @override
      * @param {string} query
      * @param {boolean} caseSensitive
      * @param {boolean} isRegex
      * @param {function(!Array.<!WebInspector.ContentProvider.SearchMatch>)} callback
      */
     searchInContent: function(query, caseSensitive, isRegex, callback)
     {
         /**
          * @param {string} content
          */
         function performSearch(content)
         {
             callback(WebInspector.ContentProvider.performSearchInContent(content, query, caseSensitive, isRegex));
         }
 
-        this._contentGetter.then(performSearch);
+        this._lazyContent().then(performSearch);
     }
 }