scheduler: Make virtual time expiration deterministic

third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h

Index: third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h
index 07cbe577a235fec0f4eacbefdc0a52ce623ef691..056c4219d60485b3ab389edb0544d28cc627abda 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h
@@ -83,6 +83,13 @@ class BLINK_PLATFORM_EXPORT WebViewScheduler {
   // 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;