Support the Text services framework based IME for Chrome AURA on Windows.

base/win/metro.cc

Index: base/win/metro.cc
===================================================================
--- base/win/metro.cc	(revision 193425)
+++ base/win/metro.cc	(working copy)
@@ -71,6 +71,10 @@
 }
 
 bool IsTSFAwareRequired() {
+#if defined(USE_AURA)
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8)
+    return true;
+#endif
   // Although this function is equal to IsMetroProcess at this moment,
   // Chrome for Win7 and Vista may support TSF in the future.
   return g_should_tsf_aware_required || IsMetroProcess();