Don't submit frames with no render passes in cc tests

cc/test/fake_compositor_frame_sink.cc

 // Copyright 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 "cc/test/fake_compositor_frame_sink.h"
 
 #include "base/bind.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "cc/output/compositor_frame_sink_client.h"
 #include "cc/resources/returned_resource.h"
@@ skipping 34 matching lines @@
   ReturnResourcesHeldByParent();
   CompositorFrameSink::DetachFromClient();
 }
 
 void FakeCompositorFrameSink::SubmitCompositorFrame(CompositorFrame frame) {
   ReturnResourcesHeldByParent();
 
   last_sent_frame_.reset(new CompositorFrame(std::move(frame)));
   ++num_sent_frames_;
 
-  if (!last_sent_frame_->render_pass_list.empty()) {
-    last_swap_rect_ = last_sent_frame_->render_pass_list.back()->damage_rect;
-    last_swap_rect_valid_ = true;
-  } else {
-    last_swap_rect_ = gfx::Rect();
-    last_swap_rect_valid_ = false;
-  }
+  last_swap_rect_ = last_sent_frame_->render_pass_list.back()->damage_rect;
 
   resources_held_by_parent_.insert(resources_held_by_parent_.end(),
                                    last_sent_frame_->resource_list.begin(),
                                    last_sent_frame_->resource_list.end());
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::BindOnce(&FakeCompositorFrameSink::DidReceiveCompositorFrameAck,
                      weak_ptr_factory_.GetWeakPtr()));
 }
 
 void FakeCompositorFrameSink::DidReceiveCompositorFrameAck() {
   client_->DidReceiveCompositorFrameAck();
 }
 
 void FakeCompositorFrameSink::ReturnResourcesHeldByParent() {
   if (last_sent_frame_) {
     // Return the last frame's resources immediately.
     ReturnedResourceArray resources;
     for (const auto& resource : resources_held_by_parent_)
       resources.push_back(resource.ToReturnedResource());
     resources_held_by_parent_.clear();
     client_->ReclaimResources(resources);
   }
 }
 
 }  // namespace cc