Check if cancelled in prepareDataOnMainThread()

third_party/WebKit/Source/bindings/core/v8/ScriptStreamer.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/core/v8/ScriptStreamer.h"
 
 #include "bindings/core/v8/ScriptStreamerThread.h"
 #include "bindings/core/v8/V8ScriptRunner.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
@@ skipping 217 matching lines @@
       MutexLocker locker(m_mutex);
       m_cancelled = true;
     }
     m_dataQueue.finish();
   }
 
  private:
   void prepareDataOnMainThread(ScriptStreamer* streamer) {
     DCHECK(isMainThread());
 
+    if (m_cancelled) {
+      m_dataQueue.finish();
+      return;
+    }
+
     // The Resource must still be alive; otherwise we should've cancelled
     // the streaming (if we have cancelled, the background thread is not
     // waiting).
     DCHECK(streamer->resource());
 
     if (!streamer->resource()->response().cacheStorageCacheName().isNull()) {
       streamer->suppressStreaming();
       cancel();
       return;
     }
@@ skipping 367 matching lines @@
   // The Resource might go out of scope if the script is no longer
   // needed. This makes PendingScript notify the ScriptStreamer when it is
   // destroyed.
   script->setStreamer(ScriptStreamer::create(script, scriptType, scriptState,
                                              compileOption, loadingTaskRunner));
 
   return true;
 }
 
 }  // namespace blink