Update from https://crrev.com/304121

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 2b8210d2d2f85de8dbb86a381abff5f6f8266be0..94016f3d5eb297c62ec496543749905254c4eba9 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -423,9 +423,6 @@ bool SchedulerStateMachine::ShouldUpdateVisibleTiles() const {
 }
 
 bool SchedulerStateMachine::ShouldAnimate() const {
-  if (!can_draw_)
-    return false;
-
   // If a commit occurred after our last call, we need to do animation again.
   if (HasAnimatedThisFrame() && !did_commit_after_animating_)
     return false;
@@ -765,29 +762,18 @@ bool SchedulerStateMachine::BeginFrameNeededToAnimateOrDraw() const {
   if (!HasInitializedOutputSurface())
     return false;
 
-  // If we can't draw, don't tick until we are notified that we can draw again.
-  if (!can_draw_)
-    return false;
-
   // The forced draw respects our normal draw scheduling, so we need to
   // request a BeginImplFrame for it.
   if (forced_redraw_state_ == FORCED_REDRAW_STATE_WAITING_FOR_DRAW)
     return true;
 
-  // There's no need to produce frames if we are not visible.
-  if (!visible_)
-    return false;
-
   // We need to draw a more complete frame than we did the last BeginImplFrame,
   // so request another BeginImplFrame in anticipation that we will have
   // additional visible tiles.
   if (swap_used_incomplete_tile_)
     return true;
 
-  if (needs_animate_)
-    return true;
-
-  return needs_redraw_;
+  return needs_animate_ || needs_redraw_;
 }
 
 // These are cases where we are very likely to draw soon, but might not