cc: Add image decode queue functionality to image manager.

cc/layers/picture_layer_unittest.cc

 // Copyright 2013 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/layers/picture_layer.h"
 
 #include <stddef.h>
 
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 293 matching lines @@
   scoped_refptr<FakePictureLayer> layer = FakePictureLayer::Create(client);
 
   auto animation_host = AnimationHost::CreateForTesting(ThreadInstance::MAIN);
 
   LayerTreeHostInProcess::InitParams params;
   params.client = &host_client1;
   params.settings = &settings;
   params.task_graph_runner = &task_graph_runner;
   params.main_task_runner = base::ThreadTaskRunnerHandle::Get();
   params.mutator_host = animation_host.get();
+  params.image_worker_task_runner = nullptr;
   std::unique_ptr<LayerTreeHost> host1 =
       LayerTreeHostInProcess::CreateSingleThreaded(&single_thread_client,
                                                    &params);
   host1->SetVisible(true);
   host_client1.SetLayerTreeHost(host1.get());
 
   auto animation_host2 = AnimationHost::CreateForTesting(ThreadInstance::MAIN);
 
   // TODO(sad): InitParams will be movable.
   LayerTreeHostInProcess::InitParams params2;
   params2.client = &host_client1;
   params2.settings = &settings;
   params2.task_graph_runner = &task_graph_runner;
   params2.main_task_runner = base::ThreadTaskRunnerHandle::Get();
   params2.client = &host_client2;
   params2.mutator_host = animation_host2.get();
+  params2.image_worker_task_runner = nullptr;
   std::unique_ptr<LayerTreeHost> host2 =
       LayerTreeHostInProcess::CreateSingleThreaded(&single_thread_client,
                                                    &params2);
   host2->SetVisible(true);
   host_client2.SetLayerTreeHost(host2.get());
 
   // The PictureLayer is put in one LayerTreeHost.
   host1->GetLayerTree()->SetRootLayer(layer);
   // Do a main frame, record the picture layers.
   EXPECT_EQ(0, layer->update_count());
@@ skipping 18 matching lines @@
   host2->Composite(base::TimeTicks::Now());
   EXPECT_EQ(3, layer->update_count());
   EXPECT_EQ(1, host2->SourceFrameNumber());
 
   animation_host->SetMutatorHostClient(nullptr);
   animation_host2->SetMutatorHostClient(nullptr);
 }
 
 }  // namespace
 }  // namespace cc