[codec][sysmem] fuchsia.media needs fuchsia.sysmem

We're plumbing fuchsia.sysmem.BufferCollectionToken via
fuchsia.media.StreamProcessor so anything with fuchsia.media will want
fuchsia.sysmem also.

Tested: CQ
Change-Id: I51bc15c5527c31e5c48368d66d72cf152c3d0f1a
diff --git a/public/dart/fuchsia_media/BUILD.gn b/public/dart/fuchsia_media/BUILD.gn
index a791939..4b3c22c 100644
--- a/public/dart/fuchsia_media/BUILD.gn
+++ b/public/dart/fuchsia_media/BUILD.gn
@@ -18,5 +18,8 @@
 
   deps = [
     "//sdk/fidl/fuchsia.media",
+    # TODO(dustingreen): Remove after soft transition done, since fuchsia.media
+    # will automatically pick up fuchsia.sysmem soon.
+    "//zircon/public/fidl/fuchsia-sysmem",
   ]
 }
diff --git a/public/sdk/fuchsia_dart.api b/public/sdk/fuchsia_dart.api
index aa360c4..07dbdae 100644
--- a/public/sdk/fuchsia_dart.api
+++ b/public/sdk/fuchsia_dart.api
@@ -21,6 +21,7 @@
 sdk://fidl/fuchsia.modular.auth
 sdk://fidl/fuchsia.speech
 sdk://fidl/fuchsia.sys
+sdk://fidl/fuchsia.sysmem
 sdk://fidl/fuchsia.ui.gfx
 sdk://fidl/fuchsia.ui.input
 sdk://fidl/fuchsia.ui.policy