cc: Throttle swaps in Scheduler instead of OutputSurface

content/renderer/gpu/compositor_output_surface.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/gpu/compositor_output_surface.h"
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
@@ skipping 112 matching lines @@
   }
 
   OnSwapAck(output_surface_id, *layout_test_previous_frame_ack_);
 
   layout_test_previous_frame_ack_->gl_frame_data = gl_frame_data.Pass();
   layout_test_previous_frame_ack_->last_software_frame_id =
       software_frame_data ? software_frame_data->id : 0;
 }
 
 void CompositorOutputSurface::SwapBuffers(cc::CompositorFrame* frame) {
+  DCHECK(!is_lost_);
+
   if (layout_test_mode_ && use_swap_compositor_frame_message_) {
     // This code path is here to support layout tests that are currently
     // doing a readback in the renderer instead of the browser. So they
     // are using deprecated code paths in the renderer and don't need to
     // actually swap anything to the browser. We shortcut the swap to the
     // browser here and just ack directly within the renderer process.
     // Once crbug.com/311404 is fixed, this can be removed.
 
     // This would indicate that crbug.com/311404 is being fixed, and this
     // block needs to be removed.
@@ skipping 134 matching lines @@
   // If this is the last surface to stop preferring smoothness,
   // Reset the main thread's priority to the default.
   if (prefers_smoothness_ == true &&
       --g_prefer_smoothness_count == 0) {
     SetThreadPriorityToDefault(main_thread_handle_);
   }
   prefers_smoothness_ = prefers_smoothness;
 }
 
 }  // namespace content