[scheduler] Delay budget-based throttling for 10s after backgrounded.

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

Index: third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h
index 0fc4578ec39a3aae1848e7ab113af041145d4ff5..c56360d30a9ba62f0e974e49ef6c6fd3427dc7e1 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl.h
@@ -73,6 +73,12 @@ class BLINK_PLATFORM_EXPORT WebViewSchedulerImpl : public WebViewScheduler {
 
   void OnThrottlingReported(base::TimeDelta throttling_duration);
 
+  // Depending on page visibility, either turns budget throttling off, or
+  // schedules a call to enable it after a grace period.
+  void UpdateBackgroundBudgetThrottlingState();
+
+  void EnableBackgroundBudgetThrottling();
+
   std::set<WebFrameSchedulerImpl*> frame_schedulers_;
   std::set<unsigned long> pending_loads_;
   WebScheduler::InterventionReporter* intervention_reporter_;  // Not owned.
@@ -88,6 +94,7 @@ class BLINK_PLATFORM_EXPORT WebViewSchedulerImpl : public WebViewScheduler {
   bool reported_background_throttling_since_navigation_;
   TaskQueueThrottler::TimeBudgetPool*
       background_time_budget_pool_;  // Not owned.
+  CancelableClosureHolder delayed_background_budget_throttling_enabler_;
   WebViewScheduler::WebViewSchedulerSettings* settings_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(WebViewSchedulerImpl);