[scheduler] Use Finch to control background throttling.

third_party/WebKit/public/platform/WebViewScheduler.h

 // Copyright 2015 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 WebViewScheduler_h
 #define WebViewScheduler_h
 
 #include "WebCommon.h"
 #include "public/platform/BlameContext.h"
 
 #include <memory>
 
 namespace blink {
 
 class WebFrameScheduler;
 
 class BLINK_PLATFORM_EXPORT WebViewScheduler {
  public:
+  // Helper interface to plumb settings from WebSettings to scheduler.
+  class BLINK_PLATFORM_EXPORT WebViewSchedulerSettings {
+   public:
+    virtual ~WebViewSchedulerSettings() {}
+
+    // Background throttling aggressiveness settings.
+    virtual float expensiveBackgroundThrottlingCPUBudget() = 0;
+    virtual float expensiveBackgroundThrottlingInitialBudget() = 0;
+    virtual float expensiveBackgroundThrottlingMaxBudget() = 0;
+    virtual float expensiveBackgroundThrottlingMaxDelay() = 0;
+  };
+
   virtual ~WebViewScheduler() {}
 
   // The scheduler may throttle tasks associated with background pages.
   virtual void setPageVisible(bool) = 0;
 
   // Creates a new WebFrameScheduler. The caller is responsible for deleting
   // it. All tasks executed by the frame scheduler will be attributed to
   // |BlameContext|.
   virtual std::unique_ptr<WebFrameScheduler> createFrameScheduler(
       BlameContext*) = 0;
@@ skipping 36 matching lines @@
   // Sets the virtual time policy, which is applied imemdiatly to all child
   // WebFrameSchedulers.
   virtual void setVirtualTimePolicy(VirtualTimePolicy) = 0;
 
   virtual void audioStateChanged(bool isAudioPlaying) = 0;
 };
 
 }  // namespace blink
 
 #endif  // WebViewScheduler