Factor out gin::IsolateHolder's constructor

third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp b/third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp
index dc94cf4b3469204149dc03ff3a661378b6c11efd..e78b0fe84b493d590622779190ef2055ef97d270 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp
@@ -51,12 +51,9 @@ static void microtasksCompletedCallback(v8::Isolate* isolate) {
   V8PerIsolateData::from(isolate)->runEndOfScopeTasks();
 }
 
-V8PerIsolateData::V8PerIsolateData(WebTaskRunner* taskRunner)
-    : m_isolateHolder(WTF::makeUnique<gin::IsolateHolder>(
-          taskRunner ? taskRunner->toSingleThreadTaskRunner() : nullptr,
-          gin::IsolateHolder::kSingleThread,
-          isMainThread() ? gin::IsolateHolder::kDisallowAtomicsWait
-                         : gin::IsolateHolder::kAllowAtomicsWait)),
+V8PerIsolateData::V8PerIsolateData(
+    std::unique_ptr<gin::IsolateHolder> isolateHolder)
+    : m_isolateHolder(std::move(isolateHolder)),
       m_stringCache(WTF::wrapUnique(new StringCache(isolate()))),
       m_hiddenValue(V8HiddenValue::create()),
       m_privateProperty(V8PrivateProperty::create()),
@@ -79,8 +76,9 @@ v8::Isolate* V8PerIsolateData::mainThreadIsolate() {
   return mainThreadPerIsolateData->isolate();
 }
 
-v8::Isolate* V8PerIsolateData::initialize(WebTaskRunner* taskRunner) {
-  V8PerIsolateData* data = new V8PerIsolateData(taskRunner);
+v8::Isolate* V8PerIsolateData::initialize(
+    std::unique_ptr<gin::IsolateHolder> isolateHolder) {
+  V8PerIsolateData* data = new V8PerIsolateData(std::move(isolateHolder));
   v8::Isolate* isolate = data->isolate();
   isolate->SetData(gin::kEmbedderBlink, data);
   return isolate;