scheduler: Throttle timers in out-of-view frames

third_party/WebKit/public/platform/WebFrameScheduler.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 WebFrameScheduler_h
 #define WebFrameScheduler_h
 
 #include "WebCommon.h"
 
 #include <string>
 
 namespace blink {
 
 class WebSecurityOrigin;
 class WebTaskRunner;
 
 class BLINK_PLATFORM_EXPORT WebFrameScheduler {
 public:
     virtual ~WebFrameScheduler() { }
 
     // The scheduler may throttle tasks associated with offscreen frames.
     virtual void setFrameVisible(bool) { }
 
     // Tells the scheduler that the page this frame belongs to is not visible.
     // The scheduler may throttle tasks associated with pages that are not visible.
     virtual void setPageVisible(bool) { }
 
+    // Set whether this frame is cross origin w.r.t. the top level frame. Cross
+    // origin frames may use a different scheduling policy from same origin
+    // frames.
+    virtual void setCrossOrigin(bool) {}
+
     // Returns the WebTaskRunner for loading tasks.
     // WebFrameScheduler owns the returned WebTaskRunner.
     virtual WebTaskRunner* loadingTaskRunner() { return nullptr; }
 
     // Returns the WebTaskRunner for timer tasks.
     // WebFrameScheduler owns the returned WebTaskRunner.
     virtual WebTaskRunner* timerTaskRunner() { return nullptr; }
 };
 
 } // namespace blink
 
 #endif // WebFrameScheduler_h