Add command line switch --enable-webrtc on Android.

WebRTC is turned off by default on Android.
This flag would allow early adapters on Android to try out WebRTC.

BUG=161417
Review URL: https://codereview.chromium.org/12079084

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@179794 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index c9afe5e..0d37934 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -424,6 +424,17 @@
 #endif
   },
   {
+    "enable-webrtc",
+    IDS_FLAGS_ENABLE_WEBRTC_NAME,
+    IDS_FLAGS_ENABLE_WEBRTC_DESCRIPTION,
+    kOsAndroid,
+#if defined(OS_ANDROID)
+    SINGLE_VALUE_TYPE(switches::kEnableWebRTC)
+#else
+    SINGLE_VALUE_TYPE("")
+#endif
+  },
+  {
     "fixed-position-creates-stacking-context",
     IDS_FLAGS_FIXED_POSITION_CREATES_STACKING_CONTEXT_NAME,
     IDS_FLAGS_FIXED_POSITION_CREATES_STACKING_CONTEXT_DESCRIPTION,