Bug 828465 - Enable Metro UI for Windows 64 builds [r=jimm]

--HG--
extra : rebase_source : 702a38ec3dd427efe7298371c726a06dec6ce81a

browser/config/mozconfigs/win64/debug

@@ -6,6 +6,7 @@ ac_add_options --host=x86_64-pc-mingw32
 ac_add_options --enable-debug
 ac_add_options --enable-trace-malloc
 ac_add_options --enable-signmar
+ac_add_options --enable-metro
 ENABLE_MARIONETTE=1
 
 # Needed to enable breakpad in application.ini

browser/config/mozconfigs/win64/nightly

@@ -11,6 +11,7 @@ ac_add_options --enable-update-packaging
 ac_add_options --enable-jemalloc
 ac_add_options --enable-signmar
 ac_add_options --enable-profiling
+ac_add_options --enable-metro
 
 # Nightlies only since this has a cost in performance
 ac_add_options --enable-js-diagnostics