cc: Move image decodes from tile manager to a separate file.

cc/BUILD.gn

 # Copyright 2014 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.
 
 import("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
@@ skipping 416 matching lines @@
     "scheduler/draw_result.h",
     "scheduler/scheduler.cc",
     "scheduler/scheduler.h",
     "scheduler/scheduler_settings.cc",
     "scheduler/scheduler_settings.h",
     "scheduler/scheduler_state_machine.cc",
     "scheduler/scheduler_state_machine.h",
     "scheduler/video_frame_controller.h",
     "tiles/eviction_tile_priority_queue.cc",
     "tiles/eviction_tile_priority_queue.h",
+    "tiles/image_decode_controller.cc",
+    "tiles/image_decode_controller.h",
     "tiles/picture_layer_tiling.cc",
     "tiles/picture_layer_tiling.h",
     "tiles/picture_layer_tiling_set.cc",
     "tiles/picture_layer_tiling_set.h",
     "tiles/prioritized_tile.cc",
     "tiles/prioritized_tile.h",
     "tiles/raster_tile_priority_queue.cc",
     "tiles/raster_tile_priority_queue.h",
     "tiles/raster_tile_priority_queue_all.cc",
     "tiles/raster_tile_priority_queue_all.h",
@@ skipping 469 matching lines @@
     "//ui/gl",
     "//ui/gl:test_support",
   ]
 
   if (is_android) {
     isolate_file = "cc_perftests.isolate"
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the cc_unittests_run target in cc_tests.gyp.