cc: Control defer_commits logic by Scheduler

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/debug/trace_event.h"
 #include "base/debug/trace_event_argument.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
@@ skipping 30 matching lines @@
       has_pending_tree_(false),
       pending_tree_is_ready_for_activation_(false),
       active_tree_needs_first_draw_(false),
       did_commit_after_animating_(false),
       did_create_and_initialize_first_output_surface_(false),
       impl_latency_takes_priority_(false),
       skip_next_begin_main_frame_to_reduce_latency_(false),
       skip_begin_main_frame_to_reduce_latency_(false),
       continuous_painting_(false),
       impl_latency_takes_priority_on_battery_(false),
-      children_need_begin_frames_(false) {
+      children_need_begin_frames_(false),
+      defer_commits_(false) {
 }
 
 const char* SchedulerStateMachine::OutputSurfaceStateToString(
     OutputSurfaceState state) {
   switch (state) {
     case OUTPUT_SURFACE_ACTIVE:
       return "OUTPUT_SURFACE_ACTIVE";
     case OUTPUT_SURFACE_LOST:
       return "OUTPUT_SURFACE_LOST";
     case OUTPUT_SURFACE_CREATING:
@@ skipping 167 matching lines @@
   state->SetBoolean("main_thread_is_in_high_latency_mode",
                     MainThreadIsInHighLatencyMode());
   state->SetBoolean("skip_begin_main_frame_to_reduce_latency",
                     skip_begin_main_frame_to_reduce_latency_);
   state->SetBoolean("skip_next_begin_main_frame_to_reduce_latency",
                     skip_next_begin_main_frame_to_reduce_latency_);
   state->SetBoolean("continuous_painting", continuous_painting_);
   state->SetBoolean("impl_latency_takes_priority_on_battery",
                     impl_latency_takes_priority_on_battery_);
   state->SetBoolean("children_need_begin_frames", children_need_begin_frames_);
+  state->SetBoolean("defer_commits", defer_commits_);
   state->EndDictionary();
 }
 
 void SchedulerStateMachine::AdvanceCurrentFrameNumber() {
   current_frame_number_++;
 
   // "Drain" the ManageTiles funnel.
   if (manage_tiles_funnel_ > 0)
     manage_tiles_funnel_--;
 
@@ skipping 148 matching lines @@
 }
 
 bool SchedulerStateMachine::CouldSendBeginMainFrame() const {
   if (!needs_commit_)
     return false;
 
   // We can not perform commits if we are not visible.
   if (!visible_)
     return false;
 
+  // We do not need new commits if it is deferred.
+  if (defer_commits_)
+    return false;
+
   return true;
 }
 
 bool SchedulerStateMachine::ShouldSendBeginMainFrame() const {
   if (!CouldSendBeginMainFrame())
     return false;
 
   // Only send BeginMainFrame when there isn't another commit pending already.
   if (commit_state_ != COMMIT_STATE_IDLE)
     return false;
@@ skipping 303 matching lines @@
   // BeginFrame, which could cause duplicate draws.
   return !settings_.using_synchronous_renderer_compositor;
 }
 
 void SchedulerStateMachine::SetChildrenNeedBeginFrames(
     bool children_need_begin_frames) {
   DCHECK(settings_.forward_begin_frames_to_children);
   children_need_begin_frames_ = children_need_begin_frames;
 }
 
+void SchedulerStateMachine::SetDeferCommits(bool defer_commits) {
+  defer_commits_ = defer_commits;
+}
+
 // These are the cases where we definitely (or almost definitely) have a
 // new frame to animate and/or draw and can draw.
 bool SchedulerStateMachine::BeginFrameNeededToAnimateOrDraw() const {
   // The output surface is the provider of BeginImplFrames, so we are not going
   // to get them even if we ask for them.
   if (!HasInitializedOutputSurface())
     return false;
 
   // The forced draw respects our normal draw scheduling, so we need to
   // request a BeginImplFrame for it.
@@ skipping 323 matching lines @@
       static_cast<int>(begin_impl_frame_state_),
       static_cast<int>(commit_state_),
       has_pending_tree_ ? 'T' : 'F',
       pending_tree_is_ready_for_activation_ ? 'T' : 'F',
       active_tree_needs_first_draw_ ? 'T' : 'F',
       max_pending_swaps_,
       pending_swaps_);
 }
 
 }  // namespace cc