cc: Simplify SetNeedsBeginFrames code in scheduler.

cc/scheduler/scheduler_state_machine.cc

Index: cc/scheduler/scheduler_state_machine.cc
diff --git a/cc/scheduler/scheduler_state_machine.cc b/cc/scheduler/scheduler_state_machine.cc
index 4e6509f527ddc35ac7be8b8355b85111f3cbbfa7..c59a924f2b7c425aa8bc68d75b3d80d4d694af80 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -735,12 +735,9 @@ bool SchedulerStateMachine::ShouldSetNeedsBeginFrames(
   if (needs_begin_frame)
     return true;
 
-  // Stop requesting BeginFrames after a deadline.
-  if (begin_impl_frame_state_ == BEGIN_IMPL_FRAME_STATE_INSIDE_DEADLINE)
-    return true;
-
-  // Stop requesting BeginFrames immediately when output surface is lost.
-  if (!HasInitializedOutputSurface())
+  // Stop requesting BeginFrames after a deadline or if we are idle
+  if (begin_impl_frame_state_ == BEGIN_IMPL_FRAME_STATE_INSIDE_DEADLINE ||
+      begin_impl_frame_state_ == BEGIN_IMPL_FRAME_STATE_IDLE)
     return true;
 
   return false;