[scheduler] Use Finch to control background throttling.

third_party/WebKit/public/platform/WebScheduler.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebScheduler_h
 #define WebScheduler_h
 
 #include "WebCommon.h"
 #include "WebString.h"
 #include "public/platform/WebTaskRunner.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/WebTraceLocation.h"
 #include "public/platform/WebViewScheduler.h"
 
 #include <memory>
 
 namespace blink {
 
+class WebSettingsImpl;
 class WebView;
 
 // This class is used to submit tasks and pass other information from Blink to
 // the platform's scheduler.
 // TODO(skyostil): Replace this class with RendererScheduler.
 class BLINK_PLATFORM_EXPORT WebScheduler {
  public:
   class BLINK_PLATFORM_EXPORT InterventionReporter {
    public:
     virtual ~InterventionReporter() {}
@@ skipping 40 matching lines @@
 
   // Returns a WebTaskRunner for loading tasks. Can be called from any thread.
   virtual WebTaskRunner* loadingTaskRunner() = 0;
 
   // Returns a WebTaskRunner for timer tasks. Can be called from any thread.
   virtual WebTaskRunner* timerTaskRunner() = 0;
 
   // Creates a new WebViewScheduler for a given WebView. Must be called from
   // the associated WebThread.
   virtual std::unique_ptr<WebViewScheduler> createWebViewScheduler(
-      InterventionReporter*) = 0;
+      InterventionReporter*,
+      WebSettingsImpl*) = 0;
 
   // Suspends the timer queue and increments the timer queue suspension count.
   // May only be called from the main thread.
   virtual void suspendTimerQueue() = 0;
 
   // Decrements the timer queue suspension count and re-enables the timer queue
   // if the suspension count is zero and the current scheduler policy allows it.
   virtual void resumeTimerQueue() = 0;
 
   enum class NavigatingFrameType { kMainFrame, kChildFrame };
@@ skipping 14 matching lines @@
 
   void postIdleTask(const WebTraceLocation&, std::unique_ptr<IdleTask>);
   void postNonNestableIdleTask(const WebTraceLocation&,
                                std::unique_ptr<IdleTask>);
 #endif
 };
 
 }  // namespace blink
 
 #endif  // WebScheduler_h