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

third_party/WebKit/Source/modules/serviceworkers/ServiceWorkerGlobalScope.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 60 matching lines @@
     ServiceWorkerThread* thread,
     std::unique_ptr<WorkerThreadStartupData> startupData) {
   // Note: startupData is finalized on return. After the relevant parts has been
   // passed along to the created 'context'.
   ServiceWorkerGlobalScope* context = new ServiceWorkerGlobalScope(
       startupData->m_scriptURL, startupData->m_userAgent, thread,
       monotonicallyIncreasingTime(),
       std::move(startupData->m_starterOriginPrivilegeData),
       startupData->m_workerClients);
 
-  context->setV8CacheOptions(startupData->m_v8CacheOptions);
+  context->setV8CacheOptions(startupData->m_workerV8Settings.m_v8CacheOptions);
   context->applyContentSecurityPolicyFromVector(
       *startupData->m_contentSecurityPolicyHeaders);
   if (!startupData->m_referrerPolicy.isNull())
     context->parseAndSetReferrerPolicy(startupData->m_referrerPolicy);
   context->setAddressSpace(startupData->m_addressSpace);
   OriginTrialContext::addTokens(context,
                                 startupData->m_originTrialTokens.get());
 
   return context;
 }
@@ skipping 162 matching lines @@
 }
 
 void ServiceWorkerGlobalScope::exceptionThrown(ErrorEvent* event) {
   WorkerGlobalScope::exceptionThrown(event);
   if (WorkerThreadDebugger* debugger =
           WorkerThreadDebugger::from(thread()->isolate()))
     debugger->exceptionThrown(thread(), event);
 }
 
 }  // namespace blink