cc: Add image decode queue functionality to image manager.

cc/tiles/tile_manager.h

Index: cc/tiles/tile_manager.h
diff --git a/cc/tiles/tile_manager.h b/cc/tiles/tile_manager.h
index 91ae0a8b4eb2d70ed4004f7119a34c5e52795424..ea71587b60dd361b140c4d5099080faebd733e31 100644
--- a/cc/tiles/tile_manager.h
+++ b/cc/tiles/tile_manager.h
@@ -21,6 +21,7 @@
 #include "cc/raster/raster_buffer_provider.h"
 #include "cc/resources/memory_history.h"
 #include "cc/resources/resource_pool.h"
+#include "cc/tiles/decoded_image_tracker.h"
 #include "cc/tiles/eviction_tile_priority_queue.h"
 #include "cc/tiles/image_controller.h"
 #include "cc/tiles/raster_tile_priority_queue.h"
@@ -98,7 +99,8 @@ RasterTaskCompletionStatsAsValue(const RasterTaskCompletionStats& stats);
 class CC_EXPORT TileManager {
  public:
   TileManager(TileManagerClient* client,
-              base::SequencedTaskRunner* task_runner,
+              base::SequencedTaskRunner* origin_task_runner,
+              scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner,
               size_t scheduled_raster_task_limit,
               bool use_partial_raster,
               bool check_tile_priority_inversion);
@@ -206,6 +208,8 @@ class CC_EXPORT TileManager {
                              Resource* resource,
                              bool was_canceled);
 
+  void SetDecodedImageTracker(DecodedImageTracker* decoded_image_tracker);
+
  protected:
   friend class Tile;
   // Must be called by tile during destruction.