Limit outstanding surface draw swaps to max_frames_pending.

cc/surfaces/display.cc

 // Copyright 2014 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 "cc/surfaces/display.h"
 
 #include "base/debug/trace_event.h"
 #include "base/message_loop/message_loop.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
@@ skipping 114 matching lines @@
            aggregator_->previous_contained_surfaces().begin();
        it != aggregator_->previous_contained_surfaces().end();
        ++it) {
     Surface* surface = manager_->GetSurfaceForId(it->first);
     if (surface)
       surface->RunDrawCallbacks();
   }
   return true;
 }
 
+void Display::DidSwapBuffers() {
+  client_->DidSwapBuffers();
+}
+
+void Display::DidSwapBuffersComplete() {
+  client_->DidSwapBuffersComplete();
+}
+
 void Display::OnSurfaceDamaged(SurfaceId surface) {
   if (aggregator_ && aggregator_->previous_contained_surfaces().count(surface))
     client_->DisplayDamaged();
 }
 
 SurfaceId Display::CurrentSurfaceId() {
   return current_surface_id_;
 }
 
+int Display::GetMaxFramesPending() {
+  if (!output_surface_)
+    return OutputSurface::DEFAULT_MAX_FRAMES_PENDING;
+  return output_surface_->capabilities().max_frames_pending;
+}
+
 }  // namespace cc