Decompose //extensions/browser/BUILD.gn

extensions/browser/api/webcam_private/BUILD.gn

Index: extensions/browser/api/webcam_private/BUILD.gn
diff --git a/extensions/browser/api/webcam_private/BUILD.gn b/extensions/browser/api/webcam_private/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..e46793d31e34dd609cd38ab74f9816fe9630751c
--- /dev/null
+++ b/extensions/browser/api/webcam_private/BUILD.gn
@@ -0,0 +1,22 @@
+# Copyright 2016 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.
+
+assert(is_chromeos)

[Devlin, 2016/09/15 00:08:04]

nit: do we have to import anything to use is_chromeos?

[Rahul Chaturvedi, 2016/09/15 00:14:57]

Nope. It is available without any imports, in fact, all is_platform variables
seem to be used without imports everywhere.

+
+source_set("webcam_private") {
+  sources = [
+    "v4l2_webcam.cc",
+    "v4l2_webcam.h",
+    "visca_webcam.cc",
+    "visca_webcam.h",
+    "webcam.cc",
+    "webcam.h",
+    "webcam_private_api.h",
+    "webcam_private_api_chromeos.cc",
+  ]
+
+  deps = [
+    "//extensions/common/api",
+  ]
+}