Script streaming: Shutdown streaming before V8.

Source/web/WebKit.cpp

Index: Source/web/WebKit.cpp
diff --git a/Source/web/WebKit.cpp b/Source/web/WebKit.cpp
index b36a3078f878ea1502cbebdd16f22c44f71fffe1..476b3c9fc3e4851f4691ee9d78e28d20a1694130 100644
--- a/Source/web/WebKit.cpp
+++ b/Source/web/WebKit.cpp
@@ -31,6 +31,7 @@
 #include "config.h"
 #include "public/web/WebKit.h"
 
+#include "bindings/core/v8/ScriptStreamerThread.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/V8Initializer.h"
@@ -204,6 +205,10 @@ void shutdown()
         s_messageLoopInterruptor = 0;
     }
 
+    // Shutdown V8-related background threads before V8 is ramped down. Note
+    // that this will wait the thread to stop its operations.
+    ScriptStreamerThread::shutdown();
+
     v8::Isolate* isolate = V8PerIsolateData::mainThreadIsolate();
     V8PerIsolateData::willBeDestroyed(isolate);