Move responsiblity of tab suspending from renderer to TabManager

components/scheduler/renderer/renderer_scheduler.h

Index: components/scheduler/renderer/renderer_scheduler.h
diff --git a/components/scheduler/renderer/renderer_scheduler.h b/components/scheduler/renderer/renderer_scheduler.h
index 50f21f6a0741a27260a34842ec1f8d45aec999b5..0bf0b8d4bddc5d9ff58f8beb939d756653191af1 100644
--- a/components/scheduler/renderer/renderer_scheduler.h
+++ b/components/scheduler/renderer/renderer_scheduler.h
@@ -127,6 +127,8 @@ class SCHEDULER_EXPORT RendererScheduler : public ChildScheduler {
   // Must be called on the main thread.
   virtual void OnRendererForegrounded() = 0;
 
+  virtual void OnRendererSuspend() = 0;
+
   // Tells the scheduler that a navigation task is pending. While any navigation
   // tasks are pending, the scheduler will ensure that loading tasks are not
   // blocked even if they are expensive. Must be called on the main thread.