CachedMetadata support for ServiceWorker script.

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 "config.h"
 #include "bindings/core/v8/ScriptStreamer.h"
 
 #include "bindings/core/v8/ScriptStreamerThread.h"
 #include "bindings/core/v8/V8ScriptRunner.h"
 #include "core/dom/Document.h"
@@ skipping 142 matching lines @@
     {
         ASSERT(isMainThread());
         // The Resource must still be alive; otherwise we should've cancelled
         // the streaming (if we have cancelled, the background thread is not
         // waiting).
         ASSERT(streamer->resource());
 
         // BOM can only occur at the beginning of the data.
         ASSERT(lengthOfBOM == 0 || m_dataPosition == 0);
 
-        if (streamer->resource()->cachedMetadata(V8ScriptRunner::tagForCodeCache(streamer->resource()))) {
+        CachedMetadataHandler* cacheHandler = streamer->resource()->cacheHandler();
+        if (cacheHandler && cacheHandler->cachedMetadata(V8ScriptRunner::tagForCodeCache(cacheHandler))) {
             // The resource has a code cache, so it's unnecessary to stream and
             // parse the code. Cancel the streaming and resume the non-streaming
             // code path.
             streamer->suppressStreaming();
             {
                 MutexLocker locker(m_mutex);
                 m_cancelled = true;
             }
             m_dataQueue.finish();
             return;
@@ skipping 318 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(resource, scriptState, compileOption));
 
     return true;
 }
 
 } // namespace blink