Decompose //extensions/browser/BUILD.gn

extensions/browser/api/document_scan/BUILD.gn

Index: extensions/browser/api/document_scan/BUILD.gn
diff --git a/extensions/browser/api/document_scan/BUILD.gn b/extensions/browser/api/document_scan/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..9112924785d5d8eeac3552a29b994398ed8a66fd
--- /dev/null
+++ b/extensions/browser/api/document_scan/BUILD.gn
@@ -0,0 +1,21 @@
+# 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.
+
+source_set("document_scan") {
+  sources = [
+    "document_scan_api.cc",
+    "document_scan_api.h",
+    "document_scan_interface.cc",
+    "document_scan_interface.h",
+    "document_scan_interface_chromeos.cc",

[Devlin, 2016/09/14 22:50:29]

this seems broken - why do we include chromeos when line 14 implies that
nonchromeos is possible here?

[Rahul Chaturvedi, 2016/09/14 23:10:24]

_chromeos files will only be compiled on Chrome OS. This is also how the
original build was setup, my parser just moved it. This could 'maybe' be done
better, but is definitely not in the scope of this CL.

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

Ah, didn't realize we had that rule.  Interesting!

+  ]
+
+  if (!is_chromeos) {
+    sources += [ "document_scan_interface_nonchromeos.cc" ]
+  }
+
+  deps = [
+    "//extensions/common/api",
+  ]
+}