media: add ArcCamera3Service Mojo service

media/capture/BUILD.gn

Index: media/capture/BUILD.gn
diff --git a/media/capture/BUILD.gn b/media/capture/BUILD.gn
index a97ff63642ff480692f3dcf1ce385a58f1590583..554c2c74d687e4c1ad0f18d2b3e966d3655b5a91 100644
--- a/media/capture/BUILD.gn
+++ b/media/capture/BUILD.gn
@@ -49,6 +49,7 @@ component("capture_lib") {
     "content/thread_safe_capture_oracle.h",
     "content/video_capture_oracle.cc",
     "content/video_capture_oracle.h",
+    "video/chromeos/arc_camera3_service.cc",
     "video/chromeos/camera_device_delegate.cc",
     "video/chromeos/camera_hal_delegate.cc",
     "video/chromeos/camera_metadata_utils.cc",
@@ -236,4 +237,8 @@ test("capture_unittests") {
     # TODO(jschuh): https://crbug.com/167187 fix size_t to int truncations.
     configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   }
+
+  if (is_chromeos) {
+    deps += [ "//mojo/edk/system" ]
+  }
 }