cc: Add image decode queue functionality to image manager.

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 2bbf7825465110fb2f64438ac05817790f2ef71a..b3eae9e444bfd62d397d9f2a4ac4b7ea0089868f 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -144,7 +144,8 @@ class CC_EXPORT LayerTreeHostImpl
       RenderingStatsInstrumentation* rendering_stats_instrumentation,
       TaskGraphRunner* task_graph_runner,
       std::unique_ptr<MutatorHost> mutator_host,
-      int id);
+      int id,
+      scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner);
   ~LayerTreeHostImpl() override;
 
   // InputHandler implementation
@@ -594,7 +595,8 @@ class CC_EXPORT LayerTreeHostImpl
       RenderingStatsInstrumentation* rendering_stats_instrumentation,
       TaskGraphRunner* task_graph_runner,
       std::unique_ptr<MutatorHost> mutator_host,
-      int id);
+      int id,
+      scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner);
 
   // Virtual for testing.
   virtual bool AnimateLayers(base::TimeTicks monotonic_time);