[ChromeOS] Expose keyboard remapping to signin screen.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index a6f312579bf1e2d3b42d98bc1446d0f4db972ade..400719f83b53c458110f1469b182b7d71260084a 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1940,6 +1940,10 @@ const char kNetworkThrottlingEnabled[] = "net.throttling_enabled";
 // Boolean prefs for the local status of the touchscreen.
 const char kTouchscreenEnabledLocal[] = "events.touch_screen.enabled_local";
 
+// The key of a string pref containing the ID of the focused user in the signin
+// screen.
+const char kFocusedPodUserId[] = "FocusedPodUserId";
+
 #endif  // defined(OS_CHROMEOS)
 
 // Whether there is a Flash version installed that supports clearing LSO data.