[Extensions + Blink] Account for user gesture in v8 function calls

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

Index: third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp b/third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp
index 9080babd3ac986d76bd3065f2a75a58ca519d961..beaa9ef9cef64ad531b334f21b0750cb8d49da93 100644
--- a/third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/DOMWrapperWorld.cpp
@@ -122,6 +122,14 @@ DOMWrapperWorld& DOMWrapperWorld::privateScriptIsolatedWorld() {
   return *cachedPrivateScriptIsolatedWorld;
 }
 
+PassRefPtr<DOMWrapperWorld> DOMWrapperWorld::fromWorldId(v8::Isolate* isolate,
+                                                         int worldId,
+                                                         int extensionGroup) {
+  if (worldId == MainWorldId)
+    return &mainWorld();
+  return ensureIsolatedWorld(isolate, worldId, extensionGroup);
+}
+
 typedef HashMap<int, DOMWrapperWorld*> WorldMap;
 static WorldMap& isolatedWorldMap() {
   ASSERT(isMainThread());