Ack swap buffers after a timeout

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 93e641409a0f43ffb24277196c9f488d29954eaf..4852f4a38b49a86322b45fc407b14289252dfc0e 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -2358,11 +2358,6 @@ void RenderWidgetHostViewMac::AddPendingSwapAck(
   // loss. Drop the old acks.
   pending_swap_ack_.reset(new PendingSwapAck(
       route_id, gpu_host_id, renderer_id));
-
-  // A trace value of 2 indicates that there is a pending swap ack. See
-  // CompositingIOSurfaceLayer's canDrawInCGLContext for other value meanings.
-  TRACE_COUNTER_ID1("browser", "PendingSwapAck",
-                    compositing_iosurface_layer_.get(), 2);
 }
 
 void RenderWidgetHostViewMac::SendPendingSwapAck() {
@@ -2376,7 +2371,6 @@ void RenderWidgetHostViewMac::SendPendingSwapAck() {
                                                  pending_swap_ack_->gpu_host_id,
                                                  ack_params);
   pending_swap_ack_.reset();
-  TRACE_COUNTER_ID1("browser", "PendingSwapAck", this, 0);
 }
 
 void RenderWidgetHostViewMac::PauseForPendingResizeOrRepaintsAndDraw() {
@@ -2486,10 +2480,6 @@ void RenderWidgetHostViewMac::AcceleratedLayerDidDrawFrame(bool succeeded) {
     GotAcceleratedCompositingError();
 }
 
-bool RenderWidgetHostViewMac::AcceleratedLayerHasNotAckedPendingFrame() const {
-  return pending_swap_ack_;
-}
-
 }  // namespace content
 
 // RenderWidgetHostViewCocoa ---------------------------------------------------