Devtools: [WIP] Implement enhanced devtools extension language APIs

Source/devtools/front_end/sources/UISourceCodeFrame.js

Index: Source/devtools/front_end/sources/UISourceCodeFrame.js
diff --git a/Source/devtools/front_end/sources/UISourceCodeFrame.js b/Source/devtools/front_end/sources/UISourceCodeFrame.js
index a6cdd620ad306077d3b56b422677a36ddb58f370..a46bd962f87b1490faf8d55634fbfcffd13c6aa4 100644
--- a/Source/devtools/front_end/sources/UISourceCodeFrame.js
+++ b/Source/devtools/front_end/sources/UISourceCodeFrame.js
@@ -114,6 +114,11 @@ WebInspector.UISourceCodeFrame.prototype = {
             this._uiSourceCode.resetWorkingCopy();
         else
             this._uiSourceCode.setWorkingCopyGetter(this._textEditor.text.bind(this._textEditor));
+        WebInspector.workspace.dispatchEventToListeners(WebInspector.Workspace.Events.UISourceCodeEdited, {
+            range: oldRange,
+            replacement: this._textEditor.copyRange(newRange),
+            uiSourceCode: this._uiSourceCode
+        });
         delete this._muteSourceCodeEvents;
     },
 
@@ -168,12 +173,39 @@ WebInspector.UISourceCodeFrame.prototype = {
         delete this._isSettingContent;
     },
 
+    /**
+     * @override
+     * @return {!Promise}
+     */
     populateTextAreaContextMenu: function(contextMenu, lineNumber, columnNumber)
     {
-        WebInspector.SourceFrame.prototype.populateTextAreaContextMenu.call(this, contextMenu, lineNumber, columnNumber);
-        contextMenu.appendApplicableItems(this._uiSourceCode);
-        contextMenu.appendApplicableItems(new WebInspector.UILocation(this._uiSourceCode, lineNumber, columnNumber));
-        contextMenu.appendSeparator();
+        /**
+         * @this {WebInspector.UISourceCodeFrame}
+         */
+        function appendItems() {
+            contextMenu.appendApplicableItems(this._uiSourceCode);
+            contextMenu.appendApplicableItems(new WebInspector.UILocation(this._uiSourceCode, lineNumber, columnNumber));
+            contextMenu.appendSeparator();
+        }
+
+        return WebInspector.SourceFrame.prototype.populateTextAreaContextMenu.call(this, contextMenu, lineNumber, columnNumber).then((function(){
+            var mimeType = WebInspector.ResourceType.mimeFromURL(this._uiSourceCode.uri());
+            if (!mimeType) {
+                return;
+            }
+            if (!WebInspector.languageService.handles.populateContextMenu(mimeType)) {
+                return;
+            }
+            return WebInspector.languageService.populateContextMenu(mimeType, {
+                source: this._uiSourceCode.uri(),
+                line: lineNumber,
+                column: columnNumber
+            }).then(function(items) {
+                items.forEach(function(elem) {
+                   contextMenu.appendItem(elem.text, elem.callback);
+                });
+            });
+        }).bind(this)).then(appendItems.bind(this), appendItems.bind(this)); //Ignore failure in language service handler
     },
 
     /**