cc: Add image decode queue functionality to image manager.

cc/tiles/tile_manager.cc

Index: cc/tiles/tile_manager.cc
diff --git a/cc/tiles/tile_manager.cc b/cc/tiles/tile_manager.cc
index 0c15378545f86b7d9e6b14bc954e6ae3ee99e63b..9b736eecb36ea6ac64eedfdb7d85f21cec03fc67 100644
--- a/cc/tiles/tile_manager.cc
+++ b/cc/tiles/tile_manager.cc
@@ -342,12 +342,14 @@ RasterTaskCompletionStatsAsValue(const RasterTaskCompletionStats& stats) {
   return std::move(state);
 }
 
-TileManager::TileManager(TileManagerClient* client,
-                         base::SequencedTaskRunner* task_runner,
-                         size_t scheduled_raster_task_limit,
-                         bool use_partial_raster)
+TileManager::TileManager(
+    TileManagerClient* client,
+    base::SequencedTaskRunner* origin_task_runner,
+    scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner,
+    size_t scheduled_raster_task_limit,
+    bool use_partial_raster)
     : client_(client),
-      task_runner_(task_runner),
+      task_runner_(origin_task_runner),
       resource_pool_(nullptr),
       tile_task_manager_(nullptr),
       scheduled_raster_task_limit_(scheduled_raster_task_limit),
@@ -356,6 +358,8 @@ TileManager::TileManager(TileManagerClient* client,
       all_tiles_that_need_to_be_rasterized_are_scheduled_(true),
       did_check_for_completed_tasks_since_last_schedule_tasks_(true),
       did_oom_on_last_assign_(false),
+      image_controller_(origin_task_runner,
+                        std::move(image_worker_task_runner)),
       more_tiles_need_prepare_check_notifier_(
           task_runner_,
           base::Bind(&TileManager::CheckIfMoreTilesNeedToBePrepared,
@@ -1047,6 +1051,10 @@ void TileManager::OnRasterTaskCompleted(
   client_->NotifyTileStateChanged(tile);
 }
 
+void TileManager::NotifyFrameFinished() {
+  image_controller_.NotifyFrameFinished();
+}
+
 ScopedTilePtr TileManager::CreateTile(const Tile::CreateInfo& info,
                                       int layer_id,
                                       int source_frame_number,