make use of media_use_ffmpeg in BUILD.gn

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/module_args/v8.gni")
+import("//media/media_options.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
 }
 
 declare_args() {
   # A list of extra dependencies to add to the root target. This allows a
   # checkout to add additional targets without explicitly changing any checked-
   # in files.
   root_extra_deps = []
@@ skipping 358 matching lines @@
       "//courgette:courgette_unittests",
       "//device:device_unittests",
       "//gin:gin_shell",
       "//gin:gin_unittests",
       "//google_apis:google_apis_unittests",
       "//google_apis/gcm:mcs_probe",
       "//gpu:angle_unittests",
       "//gpu:gpu_perftests",
       "//gpu:gl_tests",
       "//ipc:ipc_perftests",
-      "//media:ffmpeg_regression_tests",  # TODO(GYP) this should be conditional on media_use_ffmpeg
       "//media:media_perftests",
       "//media/cast:generate_barcode_video",
       "//media/cast:generate_timecode_audio",
       "//net:crash_cache",
       "//net:crl_set_dump",
       "//net:dns_fuzz_stub",
       "//net:dump_cache",
       "//net:gdig",
       "//net:get_server_time",
       "//net:net_watcher",  # TODO(GYP): This should be conditional on use_v8_in_net
@@ skipping 15 matching lines @@
     }
 
     if (enable_nacl) {
       deps += [ "//components/nacl:nacl_loader_unittests" ]
     }
 
     if (enable_nacl && enable_remoting) {
       deps += [ "//remoting:remoting_key_tester" ]
     }
 
+    if (media_use_ffmpeg) {
+      deps += [ "//media:ffmpeg_regression_tests" ]
+    }
+
     if (use_ash) {
       deps += [
         "//ash:ash_shell",
         "//ash:ash_unittests",
       ]
     }
 
     if (use_aura) {
       deps += [
         "//ui/aura:aura_unittests",
@@ skipping 491 matching lines @@
       "//ui/views:views_unittests",  # TooltipControllerTest failures
       "//ui/wm:wm_unittests",  # PASSES 4/21/2015
       "//url:url_unittests",  # PASSES 4/17/2015
 
       # TODO(GYP) nacl_integration
       # TODO(GYP) telemetry_perf_unittests
       # TODO(GYP) telemetry_unittests
     ]
   }
 }