Added Dartium changes onto 45.0.2454.104

Source/devtools/front_end/workspace/UISourceCode.js

Index: Source/devtools/front_end/workspace/UISourceCode.js
diff --git a/Source/devtools/front_end/workspace/UISourceCode.js b/Source/devtools/front_end/workspace/UISourceCode.js
index 1b374623fc42f589f914df608d9aaf80055a6e1d..5851d1ac69aad27cb5e25c252cb419e1e35833a8 100644
--- a/Source/devtools/front_end/workspace/UISourceCode.js
+++ b/Source/devtools/front_end/workspace/UISourceCode.js
@@ -39,8 +39,9 @@
  * @param {string} originURL
  * @param {string} url
  * @param {!WebInspector.ResourceType} contentType
+ * @param {string=} language
  */
-WebInspector.UISourceCode = function(project, parentPath, name, originURL, url, contentType)
+WebInspector.UISourceCode = function(project, parentPath, name, originURL, url, contentType, language)
 {
     this._project = project;
     this._parentPath = parentPath;
@@ -50,6 +51,7 @@ WebInspector.UISourceCode = function(project, parentPath, name, originURL, url,
     this._contentType = contentType;
     /** @type {!Array.<function(?string)>} */
     this._requestContentCallbacks = [];
+    this.language = url.endsWith(".dart") ? "Dart" : "JavaScript";
 
     /** @type {!Array.<!WebInspector.Revision>} */
     this.history = [];