HTML Imports: Fix race conditions on HTMLImportsChild

Source/core/dom/custom/CustomElementMicrotaskQueue.cpp

Index: Source/core/dom/custom/CustomElementMicrotaskQueue.cpp
diff --git a/Source/core/dom/custom/CustomElementMicrotaskQueue.cpp b/Source/core/dom/custom/CustomElementMicrotaskQueue.cpp
index 4e2c25f87f411aaa9e0e5ef6cc08e5f4e6af7f67..236cc54517e4b50ba8a234fc1f357ed1f97ea2c3 100644
--- a/Source/core/dom/custom/CustomElementMicrotaskQueue.cpp
+++ b/Source/core/dom/custom/CustomElementMicrotaskQueue.cpp
@@ -103,6 +103,16 @@ CustomElementMicrotaskStep::Result CustomElementMicrotaskQueue::dispatch()
     return accumulatedResult;
 }
 
+bool CustomElementMicrotaskQueue::needsProcessOrStop() const

[dominicc (has gone to gerrit), 2014/05/12 00:42:18]

I think the complexity of Imports has degraded this a bit... I think you should
try moving this back to imports (it resembles a lot of Imports code and is only
triggered by imports) and slay the complexity dragon there.

+{
+    for (size_t i = 0; i < m_queue.size(); ++i) {
+        if (m_queue[i]->needsProcessOrStop())
+            return true;
+    }
+
+    return false;
+}
+
 #if !defined(NDEBUG)
 void CustomElementMicrotaskQueue::show(unsigned indent)
 {