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

third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp

Index: third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
index daedd57d2ea097b390f9602cf1368b45244b5291..4ea5b4230b85b7ba7b485c66cceb7c68f52c4aae 100644
--- a/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebEmbeddedWorkerImpl.cpp
@@ -55,6 +55,7 @@
 #include "platform/network/ContentSecurityPolicyResponseHeaders.h"
 #include "platform/network/NetworkUtils.h"
 #include "platform/weborigin/SecurityOrigin.h"
+#include "platform/TraceEvent.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebURLRequest.h"
 #include "public/platform/modules/serviceworker/WebServiceWorkerProvider.h"
@@ -256,6 +257,7 @@ void WebEmbeddedWorkerImpl::postMessageToPageInspector(const String& message)
 
 void WebEmbeddedWorkerImpl::postTaskToLoader(const WebTraceLocation& location, std::unique_ptr<ExecutionContextTask> task)
 {
+    TRACE_EVENT0("ServiceWorker", "WebEmbeddedWorkerImpl::postTaskToLoader");
     // TODO(hiroshige,yuryu): Make this not use ExecutionContextTask and
     // consider using m_mainThreadTaskRunners->get(TaskType::Networking)
     // instead.
@@ -264,6 +266,8 @@ void WebEmbeddedWorkerImpl::postTaskToLoader(const WebTraceLocation& location, s
 
 void WebEmbeddedWorkerImpl::postTaskToWorkerGlobalScope(const WebTraceLocation& location, std::unique_ptr<ExecutionContextTask> task)
 {
+    TRACE_EVENT0("ServiceWorker", "WebEmbeddedWorkerImpl::postTaskToWorkerGlobalScope");
+    // LOG(ERROR) << "WebEmbeddedWorkerImpl::postTaskToWorkerGlobalScope";
     if (m_askedToTerminate || !m_workerThread)
         return;
     m_workerThread->postTask(location, std::move(task));