Add BUILD.gn files for chromecast/media

chromecast/media/cdm/BUILD.gn

Index: chromecast/media/cdm/BUILD.gn
diff --git a/third_party/sudden_motion_sensor/BUILD.gn b/chromecast/media/cdm/BUILD.gn
similarity index 57%
copy from third_party/sudden_motion_sensor/BUILD.gn
copy to chromecast/media/cdm/BUILD.gn
index 26bdf4284cf7a8b204c21df7562d1deeb9d6f203..1a929d07b3333ec328d11bbe69552acf7c85bb8d 100644
--- a/third_party/sudden_motion_sensor/BUILD.gn
+++ b/chromecast/media/cdm/BUILD.gn
@@ -2,13 +2,17 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-source_set("sudden_motion_sensor") {
+source_set("cdm") {
   sources = [
-    "sudden_motion_sensor_mac.cc",
-    "sudden_motion_sensor_mac.h",
+    "browser_cdm_cast.cc",
+    "browser_cdm_cast.h",
   ]
 
   deps = [
     "//base",
+    "//chromecast/media/base",
+    "//media",
   ]
+
+  configs += [ "//chromecast:config" ]
 }