Merge 107170 - DOM mutations should not be delivered on worker threads

Source/WebCore/bindings/v8/V8RecursionScope.cpp

Index: Source/WebCore/bindings/v8/V8RecursionScope.cpp
===================================================================
--- Source/WebCore/bindings/v8/V8RecursionScope.cpp	(revision 108090)
+++ Source/WebCore/bindings/v8/V8RecursionScope.cpp	(working copy)
@@ -32,11 +32,12 @@
 #include "V8RecursionScope.h"
 
 #include "IDBPendingTransactionMonitor.h"
+#include "ScriptExecutionContext.h"
 #include "WebKitMutationObserver.h"
 
 namespace WebCore {
 
-void V8RecursionScope::didLeaveScriptContext()
+void V8RecursionScope::didLeaveScriptContext(ScriptExecutionContext* context)
 {
     // FIXME: Instrument any work that takes place when script exits to c++ (e.g. Mutation Observers).
 
@@ -48,7 +49,8 @@
 #endif
 
 #if ENABLE(MUTATION_OBSERVERS)
-    WebKitMutationObserver::deliverAllMutations();
+    if (context && context->isDocument())
+        WebKitMutationObserver::deliverAllMutations();
 #endif
 }