Add blink::ServiceRegistry and expose it from LocalFrame and Platform.

third_party/WebKit/Source/platform/exported/Platform.cpp

 /*
  * Copyright (C) 2012 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 19 matching lines @@
 
 #include "base/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "platform/Histogram.h"
 #include "platform/PartitionAllocMemoryDumpProvider.h"
 #include "platform/fonts/FontCacheMemoryDumpProvider.h"
 #include "platform/graphics/CompositorFactory.h"
 #include "platform/heap/GCTaskRunner.h"
 #include "platform/web_memory_dump_provider_adapter.h"
 #include "public/platform/Platform.h"
+#include "public/platform/ServiceRegistry.h"
 #include "public/platform/WebPrerenderingSupport.h"
 #include "wtf/HashMap.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
 
 static Platform* s_platform = nullptr;
 using ProviderToAdapterMap = HashMap<WebMemoryDumpProvider*, OwnPtr<WebMemoryDumpProviderAdapter>>;
 
 static GCTaskRunner* s_gcTaskRunner = nullptr;
@@ skipping 120 matching lines @@
 
     ProviderToAdapterMap::iterator it = memoryDumpProviders().find(provider);
     if (it == memoryDumpProviders().end())
         return;
     WebMemoryDumpProviderAdapter* adapter = it->value.get();
     base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(adapter);
     adapter->set_is_registered(false);
     memoryDumpProviders().remove(it);
 }
 
+ServiceRegistry* Platform::serviceRegistry()
+{
+    return ServiceRegistry::getEmptyServiceRegistry();
+}
+
 } // namespace blink