Transitively keep track of an isolated world's children scripts and worlds.

third_party/WebKit/Source/core/dom/ScriptLoader.cpp

Index: third_party/WebKit/Source/core/dom/ScriptLoader.cpp
diff --git a/third_party/WebKit/Source/core/dom/ScriptLoader.cpp b/third_party/WebKit/Source/core/dom/ScriptLoader.cpp
index 51cc3de3567c61ce4b52e03b47cd7801bd537838..59f9f6a2fca321a9cb3b4b55a560c1e298fce140 100644
--- a/third_party/WebKit/Source/core/dom/ScriptLoader.cpp
+++ b/third_party/WebKit/Source/core/dom/ScriptLoader.cpp
@@ -60,6 +60,7 @@ namespace blink {
 ScriptLoader::ScriptLoader(Element* element, bool parserInserted, bool alreadyStarted)
     : m_element(element)
     , m_resource(0)
+    , m_originWorld(nullptr)
     , m_startLineNumber(WTF::OrdinalNumber::beforeFirst())
     , m_parserInserted(parserInserted)
     , m_isExternalScript(false)
@@ -248,6 +249,11 @@ bool ScriptLoader::prepareScript(const TextPosition& scriptStartPosition, Legacy
             return false;
     }
 
+    // Store the origin to apply when the script is done loading, as the script could be loaded in the main world.
+    if (v8::Isolate::GetCurrent()->InContext()) {
+        m_originWorld = PassRefPtr<DOMWrapperWorld>(DOMWrapperWorld::current(v8::Isolate::GetCurrent()).originWorld());
+    }
+
     if (client->hasSourceAttribute() && client->deferAttributeValue() && m_parserInserted && !client->asyncAttributeValue()) {
         m_willExecuteWhenDocumentFinishedParsing = true;
         m_willBeParserExecuted = true;
@@ -421,6 +427,9 @@ bool ScriptLoader::executeScript(const ScriptSourceCode& sourceCode, double* com
     if (isHTMLScriptLoader(m_element))
         contextDocument->pushCurrentScript(toHTMLScriptElement(m_element));
 
+    // Ensure the origin world gets propagated to the script and is reset afterwards.
+    DOMWrapperWorld::OriginWorldScope worldScope(m_originWorld);
+
     // Create a script from the script element node, using the script
     // block's source and the script block's type.
     // Note: This is where the script is compiled and actually executed.