media: add video capture device for ARC++ camera HAL v3

media/capture/video/chromeos/mojo/BUILD.gn

Index: media/capture/video/chromeos/mojo/BUILD.gn
diff --git a/media/capture/video/chromeos/mojo/BUILD.gn b/media/capture/video/chromeos/mojo/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..cf4e480660702dcb1ffdac5291ab1d2aa3c01e0a
--- /dev/null
+++ b/media/capture/video/chromeos/mojo/BUILD.gn
@@ -0,0 +1,13 @@
+# Copyright 2017 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.
+
+import("//mojo/public/tools/bindings/mojom.gni")
+
+mojom("arc_camera3") {
+  sources = [
+    "arc_camera3.mojom",
+    "arc_camera3_metadata.mojom",
+    "camera_metadata_tags.mojom",
+  ]
+}