Add callback when queueing frame on Surface to create backpressure.

content/browser/compositor/delegated_frame_host.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 "content/browser/compositor/delegated_frame_host.h"
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
@@ skipping 361 matching lines @@
           surface_factory_->Destroy(surface_id_);
         surface_id_ = id_allocator_->GenerateId();
         surface_factory_->Create(surface_id_, frame_size);
         client_->GetLayer()->SetShowSurface(surface_id_, frame_size_in_dip);
         current_surface_size_ = frame_size;
         modified_layers = true;
       }
       scoped_ptr<cc::CompositorFrame> compositor_frame =
           make_scoped_ptr(new cc::CompositorFrame());
       compositor_frame->delegated_frame_data = frame_data.Pass();
-      surface_factory_->SubmitFrame(surface_id_, compositor_frame.Pass());
+      surface_factory_->SubmitFrame(
+          surface_id_,
+          compositor_frame.Pass(),
+          base::Bind(&DelegatedFrameHost::SendDelegatedFrameAck,
+                     AsWeakPtr(),
+                     output_surface_id));
     } else {
       if (!resource_collection_) {
         resource_collection_ = new cc::DelegatedFrameResourceCollection;
         resource_collection_->SetClient(this);
       }
       // If the physical frame size changes, we need a new |frame_provider_|. If
       // the physical frame size is the same, but the size in DIP changed, we
       // need to adjust the scale at which the frames will be drawn, and we do
       // this by making a new |frame_provider_| also to ensure the scale change
       // is presented in sync with the new frame content.
@@ skipping 16 matching lines @@
 
   if (modified_layers) {
     // TODO(jbauman): Need to always tell the window observer about the
     // damage.
     client_->SchedulePaintInRect(damage_rect_in_dip);
   }
 
   pending_delegated_ack_count_++;
 
   ui::Compositor* compositor = client_->GetCompositor();
-  if (!compositor || !modified_layers) {
+  if (!compositor) {
     SendDelegatedFrameAck(output_surface_id);
-  } else {
+  } else if (!use_surfaces_) {
     std::vector<ui::LatencyInfo>::const_iterator it;
     for (it = latency_info.begin(); it != latency_info.end(); ++it)
       compositor->SetLatencyInfo(*it);
     // If we've previously skipped any latency infos add them.
     for (it = skipped_latency_info_list_.begin();
         it != skipped_latency_info_list_.end();
         ++it)
       compositor->SetLatencyInfo(*it);
     skipped_latency_info_list_.clear();
     AddOnCommitCallbackAndDisableLocks(
@@ skipping 494 matching lines @@
   if (frame_provider_.get()) {
     new_layer->SetShowDelegatedContent(frame_provider_.get(),
                                        current_frame_size_in_dip_);
   }
   if (!surface_id_.is_null()) {
     new_layer->SetShowSurface(surface_id_, current_frame_size_in_dip_);
   }
 }
 
 }  // namespace content