Load CMA backend from shared library

chromecast/base/BUILD.gn

 # Copyright 2015 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("//chrome/version.gni")  # TODO layering violation!
 import("//chromecast/chromecast.gni")
 import("//testing/test.gni")
 
 source_set("base") {
   sources = [
     "cast_paths.cc",
     "cast_paths.h",
     "chromecast_switches.cc",
     "chromecast_switches.h",
     "error_codes.cc",
     "error_codes.h",
     "path_utils.cc",
     "path_utils.h",
     "process_utils.cc",
     "process_utils.h",
     "serializers.cc",
     "serializers.h",
+    "task_runner_impl.cc",
+    "task_runner_impl.h",
   ]
 
   configs += [ "//chromecast:config" ]
 
   public_deps = [
     "//chromecast/base/metrics",
   ]
 
   deps = [
     "//base",
@@ skipping 47 matching lines @@
     "-e",
     "CAST_BUILD_INCREMENTAL=20150608.181153",
     "-e",
     "CAST_BUILD_RELEASE=1.15",
     "-e",
     "CAST_IS_DEBUG_BUILD=1",
     "-e",
     "CAST_PRODUCT_TYPE=0",
   ]
 }