DevTools: introduce WI.UISourceCode.requestMetadata()

third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js

Index: third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js
diff --git a/third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js b/third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js
index dc1debecbab3369124c37a743dafe888422eb3e3..89d3c9c2badf142da28ed020649fce6f698a43c2 100644
--- a/third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js
+++ b/third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js
@@ -98,6 +98,12 @@ WebInspector.Project.prototype = {
 
     /**
      * @param {!WebInspector.UISourceCode} uiSourceCode
+     * @return {!Promise<?WebInspector.UISourceCodeMetadata>}
+     */
+    requestMetadata: function(uiSourceCode) { },
+
+    /**
+     * @param {!WebInspector.UISourceCode} uiSourceCode
      * @param {function(?string)} callback
      */
     requestFileContent: function(uiSourceCode, callback) { },