adbd: add source/sink services.

Add some services that skip the service fd to see how much of a benefit
it'll be to eliminate it.

Test: adb raw source:$((300 * 1024 * 1024)) | pv > /dev/null
Test: dd if=/dev/zero bs=1M count=100 | pv | adb raw sink:$((100 * 1024 * 1024))
Change-Id: I042f25f85b16ae9869cb1f1e306d8671b024ed97
diff --git a/adb/Android.bp b/adb/Android.bp
index fd68bc3..6234af1 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -24,6 +24,7 @@
         "-Wno-missing-field-initializers",
         "-Wvla",
     ],
+    cpp_std: "experimental",
 
     use_version_lib: true,