scheduler: Add an unthrottled per-frame task runner

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

 /*
  * Copyright (C) 2006 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 55 matching lines @@
     void hide() override { }
     void updateFromElement(UpdateReason) override { }
     void disconnectClient() override { }
 };
 
 class EmptyFrameScheduler : public WebFrameScheduler {
 public:
     void setFrameVisible(bool) override { }
     WebTaskRunner* loadingTaskRunner() override;
     WebTaskRunner* timerTaskRunner() override;
+    WebTaskRunner* unthrottledTaskRunner() override;
 };
 
 WebTaskRunner* EmptyFrameScheduler::loadingTaskRunner()
 {
     return Platform::current()->currentThread()->getWebTaskRunner();
 }
 
 WebTaskRunner* EmptyFrameScheduler::timerTaskRunner()
 {
     return Platform::current()->currentThread()->getWebTaskRunner();
 }
 
+WebTaskRunner* EmptyFrameScheduler::unthrottledTaskRunner()
+{
+    return Platform::current()->currentThread()->getWebTaskRunner();
+}
+
 PopupMenu* EmptyChromeClient::openPopupMenu(LocalFrame&, HTMLSelectElement&)
 {
     return new EmptyPopupMenu();
 }
 
 ColorChooser* EmptyChromeClient::openColorChooser(LocalFrame*, ColorChooserClient*, const Color&)
 {
     return nullptr;
 }
 
@@ skipping 71 matching lines @@
 {
     return nullptr;
 }
 
 std::unique_ptr<WebApplicationCacheHost> EmptyFrameLoaderClient::createApplicationCacheHost(WebApplicationCacheHostClient*)
 {
     return nullptr;
 }
 
 } // namespace blink