cc: Add image decode queue functionality to image manager.

cc/trees/layer_tree_host_unittest_scroll.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/trees/layer_tree_host.h"
 
 #include "base/location.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 1307 matching lines @@
   TestTaskGraphRunner task_graph_runner;
 
   auto animation_host = AnimationHost::CreateForTesting(ThreadInstance::MAIN);
 
   LayerTreeHostInProcess::InitParams params;
   params.client = &layer_tree_host_client;
   params.task_graph_runner = &task_graph_runner;
   params.settings = &settings;
   params.main_task_runner = base::ThreadTaskRunnerHandle::Get();
   params.mutator_host = animation_host.get();
+  params.image_worker_task_runner = nullptr;
   std::unique_ptr<LayerTreeHostInProcess> layer_tree_host =
       LayerTreeHostInProcess::CreateThreaded(impl_thread.task_runner(),
                                              &params);
 
   ThreadCheckingInputHandlerClient input_handler_client(
       impl_thread.task_runner().get(), &received_stop_flinging);
   impl_thread.task_runner()->PostTask(
       FROM_HERE, base::Bind(&BindInputHandlerOnCompositorThread,
                             layer_tree_host->GetInputHandler(),
                             base::Unretained(&input_handler_client)));
@@ skipping 901 matching lines @@
 
   const float initial_page_scale_ = 0.5f;
   const float page_scale_update_ = 0.2f;
 };
 
 // The reflected deltas are supported in threaded mode only.
 MULTI_THREAD_TEST_F(LayerTreeHostScrollTestAppliesReflectedDeltas);
 
 }  // namespace
 }  // namespace cc