DevTools: [SSP] Implement adding new rule in user stylesheet

LayoutTests/inspector/elements/styles/styles-new-API.html

Index: LayoutTests/inspector/elements/styles/styles-new-API.html
diff --git a/LayoutTests/inspector/elements/styles/styles-new-API.html b/LayoutTests/inspector/elements/styles/styles-new-API.html
index 119b5015a43c7f5f7b2d8ec977a57eabc24b88be..4c5ea44b2d249cf17f87d109699583a8a5416f34 100644
--- a/LayoutTests/inspector/elements/styles/styles-new-API.html
+++ b/LayoutTests/inspector/elements/styles/styles-new-API.html
@@ -319,7 +319,13 @@ function test()
                     InspectorTest.completeTest();
                     return;
                 }
-                CSSAgent.addRule(styleSheetId, "body", ruleAdded);
+                var range = {
+                    startLine: 0,
+                    startColumn: 0,
+                    endLine: 0,
+                    endColumn: 0
+                };
+                CSSAgent.addRule(styleSheetId, "body {}", range, ruleAdded);
             }
 
             var frameId = WebInspector.resourceTreeModel.mainFrame.id;