cc: Emulate BeginFrame in OutputSurfaces that don't support it natively

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 84c43c20b1c3462b342036d0fbbc7311e9249e28..aca7f991e1e52e9514fc52a125a69aaefc16c137 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1038,11 +1038,6 @@ void LayerTreeHostImpl::SetNeedsRedrawRect(gfx::Rect damage_rect) {
   client_->SetNeedsRedrawRectOnImplThread(damage_rect);
 }
 
-void LayerTreeHostImpl::OnVSyncParametersChanged(base::TimeTicks timebase,
-                                                 base::TimeDelta interval) {
-  client_->OnVSyncParametersChanged(timebase, interval);
-}
-
 void LayerTreeHostImpl::BeginFrame(base::TimeTicks frame_time) {
   client_->BeginFrameOnImplThread(frame_time);
 }
@@ -1467,6 +1462,28 @@ bool LayerTreeHostImpl::InitializeRenderer(
     resource_provider_ = resource_provider.Pass();
   }
 
+  // Setup BeginFrameEmulation if it's not supported natively
+  if (!settings_.begin_frame_scheduling_enabled) {
+    const base::TimeDelta display_refresh_interval =
+      base::TimeDelta::FromMicroseconds(
+          base::Time::kMicrosecondsPerSecond /
+          settings_.refresh_rate);
+
+    int max_frames_pending =
+        output_surface->capabilities().max_frames_pending;
+    if (max_frames_pending <= 0)
+      max_frames_pending = FrameRateController::DEFAULT_MAX_FRAMES_PENDING;
+    if (output_surface->capabilities().has_parent_compositor)
+      max_frames_pending = 1;
+
+    output_surface->InitializeBeginFrameEmulation(
+        proxy_->ImplThread(),
+        settings_.throttle_frame_production,
+        display_refresh_interval,
+        max_frames_pending,
+        GetRendererCapabilities().using_swap_complete_callback);
+  }
+
   output_surface_ = output_surface.Pass();
 
   if (!visible_)