Capabilities + Extensions + Cast Host Extension Support for Android client

remoting/remoting.gyp

Index: remoting/remoting.gyp
diff --git a/remoting/remoting.gyp b/remoting/remoting.gyp
index f1979164b25d13dce582526ef59690c8e2a6d707..68730472bd87ef375471062923ea6fa7f1722583 100644
--- a/remoting/remoting.gyp
+++ b/remoting/remoting.gyp
@@ -9,6 +9,9 @@
     # Set this to run the jscompile checks after building the webapp.
     'run_jscompile%': 0,
 
+    # Set this to enable cast mode on the android client.
+    'enable_cast%': 0,
+
     'variables': {
       'conditions': [
         # Enable the multi-process host on Windows by default.