Make workers inherit the large heap limit of the main isolate.

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 431 matching lines @@
     document->parseAndSetReferrerPolicy(
         m_mainScriptLoader->getReferrerPolicy());
   }
 
   KURL scriptURL = m_mainScriptLoader->url();
   WorkerThreadStartMode startMode =
       m_workerInspectorProxy->workerStartMode(document);
   std::unique_ptr<WorkerSettings> workerSettings =
       WTF::wrapUnique(new WorkerSettings(document->settings()));
 
+  WorkerV8Settings workerV8Settings = WorkerV8Settings::Default();
+  workerV8Settings.m_v8CacheOptions =
+      static_cast<V8CacheOptions>(m_workerStartData.v8CacheOptions);
+
   std::unique_ptr<WorkerThreadStartupData> startupData =
       WorkerThreadStartupData::create(
           scriptURL, m_workerStartData.userAgent, m_mainScriptLoader->script(),
           m_mainScriptLoader->releaseCachedMetadata(), startMode,
           document->contentSecurityPolicy()->headers().get(),
           m_mainScriptLoader->getReferrerPolicy(), starterOrigin, workerClients,
           m_mainScriptLoader->responseAddressSpace(),
           m_mainScriptLoader->originTrialTokens(), std::move(workerSettings),
-          static_cast<V8CacheOptions>(m_workerStartData.v8CacheOptions));
+          workerV8Settings);
 
   m_mainScriptLoader.clear();
 
   // We have a dummy document here for loading but it doesn't really represent
   // the document/frame of associated document(s) for this worker. Here we
   // populate the task runners with null document not to confuse the frame
   // scheduler (which will end up using the thread's default task runner).
   m_mainThreadTaskRunners = ParentFrameTaskRunners::create(nullptr);
 
   m_workerGlobalScopeProxy = ServiceWorkerGlobalScopeProxy::create(
       *this, *document, *m_workerContextClient);
   m_loaderProxy = WorkerLoaderProxy::create(this);
   m_workerThread =
       ServiceWorkerThread::create(m_loaderProxy, *m_workerGlobalScopeProxy);
   m_workerThread->start(std::move(startupData));
   m_workerInspectorProxy->workerThreadCreated(document, m_workerThread.get(),
                                               scriptURL);
 }
 
 }  // namespace blink