cc: Throttle swaps in Scheduler instead of OutputSurface

content/browser/android/in_process/synchronous_compositor_output_surface.cc

Index: content/browser/android/in_process/synchronous_compositor_output_surface.cc
diff --git a/content/browser/android/in_process/synchronous_compositor_output_surface.cc b/content/browser/android/in_process/synchronous_compositor_output_surface.cc
index af79e1b0cd35dc75d90cb7d6487bfd95683165c5..792332546698a6ab9d6fee6882b01528f2f37bea 100644
--- a/content/browser/android/in_process/synchronous_compositor_output_surface.cc
+++ b/content/browser/android/in_process/synchronous_compositor_output_surface.cc
@@ -135,6 +135,8 @@ void SynchronousCompositorOutputSurface::SetNeedsBeginFrame(bool enable) {
 void SynchronousCompositorOutputSurface::SwapBuffers(
     cc::CompositorFrame* frame) {
   DCHECK(CalledOnValidThread());
+  DCHECK(!is_lost_);
+
   if (!ForcedDrawToSoftwareDevice()) {
     DCHECK(context_provider_);
     context_provider_->ContextGL()->ShallowFlushCHROMIUM();