cc: Move SyncedScrollOffset to scroll tree

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 304 matching lines @@
     "proto/base_conversions.h",
     "proto/cc_conversions.cc",
     "proto/cc_conversions.h",
     "proto/gfx_conversions.cc",
     "proto/gfx_conversions.h",
     "proto/gpu_conversions.cc",
     "proto/gpu_conversions.h",
     "proto/image_serialization_processor.h",
     "proto/skia_conversions.cc",
     "proto/skia_conversions.h",
+    "proto/synced_property_conversions.cc",
+    "proto/synced_property_conversions.h",
     "quads/content_draw_quad_base.cc",
     "quads/content_draw_quad_base.h",
     "quads/debug_border_draw_quad.cc",
     "quads/debug_border_draw_quad.h",
     "quads/draw_polygon.cc",
     "quads/draw_polygon.h",
     "quads/draw_quad.cc",
     "quads/draw_quad.h",
     "quads/io_surface_draw_quad.cc",
     "quads/io_surface_draw_quad.h",
@@ skipping 492 matching lines @@
     "output/texture_mailbox_deleter_unittest.cc",
     "playback/discardable_image_map_unittest.cc",
     "playback/display_item_list_unittest.cc",
     "playback/display_list_raster_source_unittest.cc",
     "playback/display_list_recording_source_unittest.cc",
     "proto/base_conversions_unittest.cc",
     "proto/cc_conversions_unittest.cc",
     "proto/gfx_conversions_unittest.cc",
     "proto/gpu_conversions_unittest.cc",
     "proto/skia_conversions_unittest.cc",
+    "proto/synced_property_conversions_unittest.cc",
     "quads/draw_polygon_unittest.cc",
     "quads/draw_quad_unittest.cc",
     "quads/render_pass_unittest.cc",
     "raster/scoped_gpu_raster_unittest.cc",
     "raster/single_thread_task_graph_runner_unittest.cc",
     "raster/synchronous_task_graph_runner_unittest.cc",
     "raster/texture_compressor_etc1_unittest.cc",
     "raster/tile_task_worker_pool_unittest.cc",
     "resources/platform_color_unittest.cc",
     "resources/resource_pool_unittest.cc",
@@ skipping 138 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.