Add BUILD.gn files for chromecast/media

chromecast/media/cma/ipc/BUILD.gn

Index: chromecast/media/cma/ipc/BUILD.gn
diff --git a/chromecast/media/cma/ipc/BUILD.gn b/chromecast/media/cma/ipc/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..037b3bdd6a7b7440fa7d1bd72dd96ab251c77356
--- /dev/null
+++ b/chromecast/media/cma/ipc/BUILD.gn
@@ -0,0 +1,21 @@
+# 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.
+
+source_set("ipc") {
+  sources = [
+    "media_memory_chunk.cc",
+    "media_memory_chunk.h",
+    "media_message.cc",
+    "media_message.h",
+    "media_message_fifo.cc",
+    "media_message_fifo.h",
+    "media_message_type.h",
+  ]
+
+  deps = [
+    "//base",
+  ]
+
+  configs += [ "//chromecast:config" ]
+}