Add a DevTools command to create an isolated world for a given frame

third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp

Index: third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp b/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
index 8f03da4fe08d79e3a69f87743a86a5ce465c4aad..fe201abf5ff1e33e963331e929fffa5cacdc31be 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
@@ -371,4 +371,11 @@ void ScriptController::ExecuteScriptInIsolatedWorld(
   }
 }
 
+void ScriptController::EnsureIsolatedWorld(int world_id) {
+  RefPtr<DOMWrapperWorld> world =
+      DOMWrapperWorld::EnsureIsolatedWorld(GetIsolate(), world_id);
+  // Make sure the execution context exists.
+  WindowProxy(*world);
+}
+
 }  // namespace blink