cc: Remove retro frames from 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 35e73f696961f5a04d11f72962a04434aec89bcf..bcd1ff49b6c6010425807c84ff67a9169fd3509c 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -86,8 +86,6 @@ const char* SchedulerStateMachine::BeginImplFrameStateToString(
   switch (state) {
     case BEGIN_IMPL_FRAME_STATE_IDLE:
       return "BEGIN_IMPL_FRAME_STATE_IDLE";
-    case BEGIN_IMPL_FRAME_STATE_BEGIN_FRAME_STARTING:
-      return "BEGIN_IMPL_FRAME_STATE_BEGIN_FRAME_STARTING";
     case BEGIN_IMPL_FRAME_STATE_INSIDE_BEGIN_FRAME:
       return "BEGIN_IMPL_FRAME_STATE_INSIDE_BEGIN_FRAME";
     case BEGIN_IMPL_FRAME_STATE_INSIDE_DEADLINE:
@@ -536,8 +534,8 @@ bool SchedulerStateMachine::ShouldInvalidateOutputSurface() const {
   if (!settings_.using_synchronous_renderer_compositor)
     return false;
 
-  // Invalidations are only performed inside a BeginFrame.
-  if (begin_impl_frame_state_ != BEGIN_IMPL_FRAME_STATE_BEGIN_FRAME_STARTING)
+  // Invalidate only within a BeginFrame.
+  if (begin_impl_frame_state_ != BEGIN_IMPL_FRAME_STATE_INSIDE_BEGIN_FRAME)
     return false;
 
   // TODO(sunnyps): needs_prepare_tiles_ is needed here because PrepareTiles is
@@ -860,7 +858,7 @@ bool SchedulerStateMachine::ProactiveBeginFrameWanted() const {
 }
 
 void SchedulerStateMachine::OnBeginImplFrame() {
-  begin_impl_frame_state_ = BEGIN_IMPL_FRAME_STATE_BEGIN_FRAME_STARTING;
+  begin_impl_frame_state_ = BEGIN_IMPL_FRAME_STATE_INSIDE_BEGIN_FRAME;
   current_frame_number_++;
 
   last_commit_had_no_updates_ = false;
@@ -877,10 +875,6 @@ void SchedulerStateMachine::OnBeginImplFrame() {
     prepare_tiles_funnel_--;
 }
 
-void SchedulerStateMachine::OnBeginImplFrameDeadlinePending() {
-  begin_impl_frame_state_ = BEGIN_IMPL_FRAME_STATE_INSIDE_BEGIN_FRAME;
-}
-
 void SchedulerStateMachine::OnBeginImplFrameDeadline() {
   begin_impl_frame_state_ = BEGIN_IMPL_FRAME_STATE_INSIDE_DEADLINE;