Remove SendBeginFramesToChildren plumbing

cc/scheduler/scheduler_state_machine.cc

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/scheduler/scheduler_state_machine.h"
 
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 37 matching lines @@
       has_pending_tree_(false),
       pending_tree_is_ready_for_activation_(false),
       active_tree_needs_first_draw_(false),
       did_create_and_initialize_first_output_surface_(false),
       tree_priority_(NEW_CONTENT_TAKES_PRIORITY),
       scroll_handler_state_(
           ScrollHandlerState::SCROLL_DOES_NOT_AFFECT_SCROLL_HANDLER),
       critical_begin_main_frame_to_activate_is_fast_(true),
       main_thread_missed_last_deadline_(false),
       skip_next_begin_main_frame_to_reduce_latency_(false),
-      children_need_begin_frames_(false),
       defer_commits_(false),
       video_needs_begin_frames_(false),
       last_commit_had_no_updates_(false),
       wait_for_ready_to_draw_(false),
       did_draw_in_last_frame_(false),
       did_swap_in_last_frame_(false) {}
 
 const char* SchedulerStateMachine::OutputSurfaceStateToString(
     OutputSurfaceState state) {
   switch (state) {
@@ skipping 180 matching lines @@
                     did_create_and_initialize_first_output_surface_);
   state->SetString("tree_priority", TreePriorityToString(tree_priority_));
   state->SetString("scroll_handler_state",
                    ScrollHandlerStateToString(scroll_handler_state_));
   state->SetBoolean("critical_begin_main_frame_to_activate_is_fast_",
                     critical_begin_main_frame_to_activate_is_fast_);
   state->SetBoolean("main_thread_missed_last_deadline",
                     main_thread_missed_last_deadline_);
   state->SetBoolean("skip_next_begin_main_frame_to_reduce_latency",
                     skip_next_begin_main_frame_to_reduce_latency_);
-  state->SetBoolean("children_need_begin_frames", children_need_begin_frames_);
   state->SetBoolean("video_needs_begin_frames", video_needs_begin_frames_);
   state->SetBoolean("defer_commits", defer_commits_);
   state->SetBoolean("last_commit_had_no_updates", last_commit_had_no_updates_);
   state->SetBoolean("did_draw_in_last_frame", did_draw_in_last_frame_);
   state->SetBoolean("did_swap_in_last_frame", did_swap_in_last_frame_);
   state->EndDictionary();
 }
 
 bool SchedulerStateMachine::PendingDrawsShouldBeAborted() const {
   // Normally when |visible_| is false or |begin_frame_source_paused_| is true,
@@ skipping 488 matching lines @@
   active_tree_needs_first_draw_ = false;  // blocks commit if true
 }
 
 void SchedulerStateMachine::SetSkipNextBeginMainFrameToReduceLatency() {
   TRACE_EVENT_INSTANT0("cc",
                        "Scheduler: SkipNextBeginMainFrameToReduceLatency",
                        TRACE_EVENT_SCOPE_THREAD);
   skip_next_begin_main_frame_to_reduce_latency_ = true;
 }
 
-bool SchedulerStateMachine::BeginFrameRequiredForChildren() const {
-  return children_need_begin_frames_;
-}
-
 bool SchedulerStateMachine::BeginFrameNeededForVideo() const {
   return video_needs_begin_frames_;
 }
 
 bool SchedulerStateMachine::BeginFrameNeeded() const {
   // We can't handle BeginFrames when output surface isn't initialized.
   // TODO(brianderson): Support output surface creation inside a BeginFrame.
   if (!HasInitializedOutputSurface())
     return false;
 
   // If we are not visible, we don't need BeginFrame messages.
   if (!visible_)
     return false;
 
-  return (BeginFrameRequiredForAction() || BeginFrameRequiredForChildren() ||
-          BeginFrameNeededForVideo() || ProactiveBeginFrameWanted());
-}
-
-void SchedulerStateMachine::SetChildrenNeedBeginFrames(
-    bool children_need_begin_frames) {
-  children_need_begin_frames_ = children_need_begin_frames;
+  return BeginFrameRequiredForAction() || BeginFrameNeededForVideo() ||
+         ProactiveBeginFrameWanted();
 }
 
 void SchedulerStateMachine::SetVideoNeedsBeginFrames(
     bool video_needs_begin_frames) {
   video_needs_begin_frames_ = video_needs_begin_frames;
 }
 
 void SchedulerStateMachine::SetDeferCommits(bool defer_commits) {
   defer_commits_ = defer_commits;
 }
@@ skipping 349 matching lines @@
     case OUTPUT_SURFACE_ACTIVE:
     case OUTPUT_SURFACE_WAITING_FOR_FIRST_COMMIT:
     case OUTPUT_SURFACE_WAITING_FOR_FIRST_ACTIVATION:
       return true;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace cc