scheduler: Make virtual time expiration deterministic

third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.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 THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_WEB_VIEW_SCHEDULER_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_WEB_VIEW_SCHEDULER_H_
 
 #include "platform/PlatformExport.h"
 #include "platform/wtf/Functional.h"
 #include "public/platform/BlameContext.h"
@@ skipping 65 matching lines @@
     // document is being parsed on a background thread. Initially virtual time
     // is not allowed to advance until we have seen at least one load. The aim
     // being to try and make loading (more) deterministic.
     DETERMINISTIC_LOADING
   };
 
   // Sets the virtual time policy, which is applied imemdiatly to all child
   // WebFrameSchedulers.
   virtual void SetVirtualTimePolicy(VirtualTimePolicy) = 0;
 
+  // Set the remaining virtual time budget to |budget|. Once the budget runs
+  // out, |budget_exhausted_callback| is called. Note that the virtual time
+  // policy is not affected when the budget expires.
+  virtual void GrantVirtualTimeBudget(
+      base::TimeDelta budget,
+      std::unique_ptr<WTF::Closure> budget_exhausted_callback) = 0;
+
   virtual void AudioStateChanged(bool is_audio_playing) = 0;
 
   virtual bool HasActiveConnectionForTest() const = 0;
 };
 
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_RENDERER_WEB_VIEW_SCHEDULER_H_