Make some build settings more flexible.

BUG=issue676
TEST=trybots

Review URL: https://webrtc-codereview.appspot.com/700006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2524 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc.gyp

@@ -1,4 +1,4 @@
-# Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+# Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
@@ -22,6 +22,7 @@
         'src/test/metrics.gyp:*',
         'src/test/test.gyp:*',
         'tools/e2e_quality/e2e_quality.gyp:*',
+        '<(webrtc_vp8_dir)/main/source/vp8.gyp:*'
       ],
     },
   ],