Unified BeginFrame scheduling

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 311a71d4b0a66135b84cd0f5f0e1ea9279548d4c..778bfb351bf626a1498b0c2527ff998402adba07 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -46,6 +46,7 @@ class SchedulerClient {
   virtual base::TimeDelta BeginMainFrameToCommitDurationEstimate() = 0;
   virtual base::TimeDelta CommitToActivateDurationEstimate() = 0;
   virtual void DidBeginImplFrameDeadline() = 0;
+  virtual void SendBeginFrameToChildren(const BeginFrameArgs& args) = 0;
 
  protected:
   virtual ~SchedulerClient() {}
@@ -58,8 +59,10 @@ class CC_EXPORT Scheduler {
       const SchedulerSettings& scheduler_settings,
       int layer_tree_host_id,
       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner) {
-    return make_scoped_ptr(new Scheduler(
-        client, scheduler_settings, layer_tree_host_id, task_runner));
+    return make_scoped_ptr(new Scheduler(client,
+                                         scheduler_settings,
+                                         layer_tree_host_id,
+                                         task_runner));
   }
 
   virtual ~Scheduler();
@@ -143,6 +146,11 @@ class CC_EXPORT Scheduler {
     state_machine_.SetContinuousPainting(continuous_painting);
   }
 
+  // SetChildrenNeedBeginFrames() is only used when this Scheduler is acting
+  // as the publisher.
+  void SetChildrenNeedBeginFrames(bool need_begin_frame);
+  void SetAuthoritativeVSyncInterval(base::TimeDelta interval);
+
  protected:
   class CC_EXPORT SyntheticBeginFrameSource : public TimeSourceClient {
    public:
@@ -184,6 +192,9 @@ class CC_EXPORT Scheduler {
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   base::TimeDelta vsync_interval_;
+  base::TimeDelta authoritative_vsync_interval_;

[mithro-old, 2014/09/09 03:22:37]

What is the difference between "authoritative_vsync_interval" and
"vsync_interval"?

+  base::TimeTicks last_timebase_;
+
   base::TimeDelta estimated_parent_draw_time_;
 
   bool last_set_needs_begin_frame_;