Adds more BUILD.gns to ash

ash/common/BUILD.gn

Index: ash/common/BUILD.gn
diff --git a/ash/common/BUILD.gn b/ash/common/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..0a39335083cee216a85637afebc6219a67aef268
--- /dev/null
+++ b/ash/common/BUILD.gn
@@ -0,0 +1,29 @@
+# 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.
+
+import("//build/config/features.gni")

[msw, 2016/10/07 22:02:24]

q: what is this needed for? (maybe is_chromeos, but I don't see it)

[sky, 2016/10/07 22:23:14]

I got lazy. I had one error and copied all the imports. Apparently none of these
are necessary, nuked.

+import("//build/config/ui.gni")

[msw, 2016/10/07 22:02:24]

nit: probably not needed yet (but maybe will be eventually).

[sky, 2016/10/07 22:23:14]

Done.

+import("//testing/test.gni")

[msw, 2016/10/07 22:02:24]

nit: not needed (using source_set here instead of test)

[sky, 2016/10/07 22:23:14]

Done.

+import("//ui/base/ui_features.gni")

[msw, 2016/10/07 22:02:24]

nit: probably not needed yet (but maybe will be eventually).

[sky, 2016/10/07 22:23:14]

Done.

+
+source_set("unittests") {
+  testonly = true
+  sources = [
+    "wm_window_unittest.cc",
+  ]
+  deps = [
+    "//ash",
+    "//ash/common/test:test_support",
+    "//ash/test:test_support_without_content",
+    "//ui/base",
+    "//ui/display",
+    "//ui/keyboard",
+    "//ui/views",
+    "//ui/wm",
+  ]
+
+  if (is_chromeos) {
+    sources += [ "system/chromeos/brightness/tray_brightness_unittest.cc" ]
+  }
+}