cc: ReadyToDraw notifications.

Send notifications when all visible tiles on the active tree are ready
to draw.

R=enne@chromium.org,reveman@chromium.org,brianderson@chromium.org,vmpstr@chromium.org
BUG=426501

Review URL: https://codereview.chromium.org/672283003

Cr-Commit-Position: refs/heads/master@{#303706}

2 files changed, 6 insertions, 0 deletions

diff --git a/cc/scheduler/scheduler.cc b/cc/scheduler/scheduler.cc
index 4c2316f..2a86d4b 100644
--- a/cc/scheduler/scheduler.cc
+++ b/cc/scheduler/scheduler.cc
@@ -197,6 +197,11 @@ void Scheduler::NotifyReadyToActivate() {
   ProcessScheduledActions();
 }
 
+void Scheduler::NotifyReadyToDraw() {
+  // Empty for now, until we take action based on the notification as part of
+  // crbugs 352894, 383157, 421923.
+}
+
 void Scheduler::SetNeedsCommit() {
   state_machine_.SetNeedsCommit();
   ProcessScheduledActions();
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index f470d17..abbfcb7 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -107,6 +107,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn,
   void SetVisible(bool visible);
   void SetCanDraw(bool can_draw);
   void NotifyReadyToActivate();
+  void NotifyReadyToDraw();
 
   void SetNeedsCommit();