[proof-of-concept] SW thread independent of the main thread

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 2457b648018b8cbe9c0e67af364009ecc169c95b..38c4ac4e6769aba6838cf73e2ba6092016120cd3 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -122,6 +122,7 @@ class RendererBlinkPlatformImpl;
 class RendererDemuxerAndroid;
 class RendererGpuVideoAcceleratorFactories;
 class ResourceDispatchThrottler;
+class IsolatedWorkerManager;
 class V8SamplingProfiler;
 class VideoCaptureImplManager;
 
@@ -550,6 +551,8 @@ class CONTENT_EXPORT RenderThreadImpl
   scoped_refptr<RendererDemuxerAndroid> renderer_demuxer_;
 #endif
   scoped_refptr<DevToolsAgentFilter> devtools_agent_message_filter_;
+  scoped_refptr<IsolatedWorkerManager> isolated_worker_manager_;
+
   std::unique_ptr<V8SamplingProfiler> v8_sampling_profiler_;
 
   std::unique_ptr<BrowserPluginManager> browser_plugin_manager_;