Reland fix for thumbnail generation.

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 <algorithm>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 392 matching lines @@
     if (resource_collection_.get()) {
       resource_collection_->SetClient(NULL);
 
       if (resource_collection_->LoseAllResources())
         SendReturnedDelegatedResources(last_output_surface_id_);
 
       resource_collection_ = NULL;
     }
     last_output_surface_id_ = output_surface_id;
   }
-  bool immediate_ack = !compositor_;
+  bool skip_frame_size_mismatch = false;
   pending_delegated_ack_count_++;
 
   if (frame_size.IsEmpty()) {
     DCHECK(frame_data->resource_list.empty());
     EvictDelegatedFrame();
   } else {
     if (use_surfaces_) {
       ImageTransportFactory* factory = ImageTransportFactory::GetInstance();
       cc::SurfaceManager* manager = factory->GetSurfaceManager();
       if (!surface_factory_) {
@@ skipping 16 matching lines @@
         current_scale_factor_ = frame_device_scale_factor;
       }
 
       frame->metadata.latency_info.insert(frame->metadata.latency_info.end(),
                                           skipped_latency_info_list_.begin(),
                                           skipped_latency_info_list_.end());
       skipped_latency_info_list_.clear();
 
       gfx::Size desired_size = client_->DelegatedFrameHostDesiredSizeInDIP();
       if (desired_size != frame_size_in_dip && !desired_size.IsEmpty())
-        immediate_ack = true;
+        skip_frame_size_mismatch = true;
 
       cc::SurfaceFactory::DrawCallback ack_callback;
-      if (compositor_ && !immediate_ack) {
+      if (compositor_ && !skip_frame_size_mismatch) {
         ack_callback = base::Bind(&DelegatedFrameHost::SurfaceDrawn,
                                   AsWeakPtr(), output_surface_id);
       }
       surface_factory_->SubmitCompositorFrame(surface_id_, std::move(frame),
                                               ack_callback);
     } else {
       if (!resource_collection_.get()) {
         resource_collection_ = new cc::DelegatedFrameResourceCollection;
         resource_collection_->SetClient(this);
       }
@@ skipping 15 matching lines @@
     }
   }
   released_front_lock_ = NULL;
   current_frame_size_in_dip_ = frame_size_in_dip;
   CheckResizeLock();
 
   if (!damage_rect_in_dip.IsEmpty())
     client_->DelegatedFrameHostGetLayer()->OnDelegatedFrameDamage(
         damage_rect_in_dip);
 
-  if (immediate_ack) {
+  // Note that |compositor_| may be reset by SetShowSurface or
+  // SetShowDelegatedContent above.
+  if (!compositor_ || skip_frame_size_mismatch) {
     SendDelegatedFrameAck(output_surface_id);
   } else if (!use_surfaces_) {
     std::vector<ui::LatencyInfo>::const_iterator it;
     for (it = frame->metadata.latency_info.begin();
          it != frame->metadata.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)
@@ skipping 576 matching lines @@
     cc::SurfaceManager* manager = factory->GetSurfaceManager();
     new_layer->SetShowSurface(
         surface_id_, base::Bind(&SatisfyCallback, base::Unretained(manager)),
         base::Bind(&RequireCallback, base::Unretained(manager)),
         current_surface_size_, current_scale_factor_,
         current_frame_size_in_dip_);
   }
 }
 
 }  // namespace content