Merge 106636 - Crash when trying to add a timer to a detached document.

Source/WebCore/page/DOMTimer.cpp

Index: Source/WebCore/page/DOMTimer.cpp
===================================================================
--- Source/WebCore/page/DOMTimer.cpp	(revision 106681)
+++ Source/WebCore/page/DOMTimer.cpp	(working copy)
@@ -27,6 +27,7 @@
 #include "config.h"
 #include "DOMTimer.h"
 
+#include "Document.h"
 #include "InspectorInstrumentation.h"
 #include "ScheduledAction.h"
 #include "ScriptExecutionContext.h"
@@ -70,6 +71,9 @@
     , m_originalInterval(interval)
     , m_shouldForwardUserGesture(shouldForwardUserGesture(interval, m_nestingLevel))
 {
+    // FIXME: remove once we found out the root cause for http://webkit.org/b/77370
+    if (scriptExecutionContext()->isDocument() && !static_cast<Document*>(scriptExecutionContext())->frame())
+        CRASH();
     scriptExecutionContext()->addTimeout(m_timeoutId, this);
 
     double intervalMilliseconds = intervalClampedToMinimum(interval, context->minimumTimerInterval());