[scheduler] Split suspendable tq from unthrottled tq.

third_party/WebKit/Source/core/loader/EmptyClients.cpp

Index: third_party/WebKit/Source/core/loader/EmptyClients.cpp
diff --git a/third_party/WebKit/Source/core/loader/EmptyClients.cpp b/third_party/WebKit/Source/core/loader/EmptyClients.cpp
index 0a7bb3fc802df4bde36fc93b9cdda3d59510a34f..fb85a1932fa052ffb2ba5a0492ed51daff8f4964 100644
--- a/third_party/WebKit/Source/core/loader/EmptyClients.cpp
+++ b/third_party/WebKit/Source/core/loader/EmptyClients.cpp
@@ -76,6 +76,7 @@ class EmptyFrameScheduler : public WebFrameScheduler {
   RefPtr<WebTaskRunner> loadingTaskRunner() override;
   RefPtr<WebTaskRunner> timerTaskRunner() override;
   RefPtr<WebTaskRunner> unthrottledTaskRunner() override;
+  RefPtr<WebTaskRunner> suspendableTaskRunner() override;
 };
 
 RefPtr<WebTaskRunner> EmptyFrameScheduler::loadingTaskRunner() {
@@ -90,6 +91,10 @@ RefPtr<WebTaskRunner> EmptyFrameScheduler::unthrottledTaskRunner() {
   return Platform::current()->mainThread()->getWebTaskRunner();
 }
 
+RefPtr<WebTaskRunner> EmptyFrameScheduler::suspendableTaskRunner() {
+  return Platform::current()->mainThread()->getWebTaskRunner();
+}
+
 PopupMenu* EmptyChromeClient::openPopupMenu(LocalFrame&, HTMLSelectElement&) {
   return new EmptyPopupMenu();
 }