Add ArcGpuVideoDecodeAccelerator.

chrome/chrome_gpu.gypi

Index: chrome/chrome_gpu.gypi
diff --git a/chrome/chrome_gpu.gypi b/chrome/chrome_gpu.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..6f06f9dd8fc883e3225d555118e2c9fab22223b4
--- /dev/null
+++ b/chrome/chrome_gpu.gypi
@@ -0,0 +1,26 @@
+# 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.
+
+{
+  'targets': [
+    {
+      # GN version: //chrome/gpu
+      'target_name': 'gpu',
+      'type': 'static_library',
+      'include_dirs': [
+        '..',
+        '<(grit_out_dir)',
+      ],
+      'conditions': [
+        ['chromeos==1', {
+          'sources': [
+            'gpu/arc_gpu_video_decode_accelerator.cc',
+            'gpu/arc_gpu_video_decode_accelerator.h',
+            'gpu/arc_video_accelerator.h',
+          ],
+        }],
+      ],
+    },
+  ],
+}