Add ToString() to VideoSendStream::Config.

Adds ToString() to subsequent parts as well as a common.gyp to define
ToString() methods for config.h. VideoStream is also moved to config.h.

BUG=3171
R=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/11329004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6170 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/webrtc.gyp b/webrtc/webrtc.gyp
index f376c06..d50552d 100644
--- a/webrtc/webrtc.gyp
+++ b/webrtc/webrtc.gyp
@@ -20,6 +20,7 @@
   'variables': {
     'webrtc_all_dependencies': [
       'base/base.gyp:*',
+      'common.gyp:*',
       'common_audio/common_audio.gyp:*',
       'common_video/common_video.gyp:*',
       'modules/modules.gyp:*',
@@ -75,6 +76,7 @@
         '<@(webrtc_video_sources)',
       ],
       'dependencies': [
+        'common.gyp:*',
         '<@(webrtc_video_dependencies)',
       ],
     },