[Smart Lock] Add a setting to require close proximity in order for unlocking to work.

components/proximity_auth/switches.h

Index: components/proximity_auth/switches.h
diff --git a/components/feedback/feedback_switches.h b/components/proximity_auth/switches.h
similarity index 58%
copy from components/feedback/feedback_switches.h
copy to components/proximity_auth/switches.h
index 046a827d3567b639eb4c6393e31e96899ff25690..0e8fed740965d21253792fceaa6e77dddf6014c5 100644
--- a/components/feedback/feedback_switches.h
+++ b/components/proximity_auth/switches.h
@@ -2,15 +2,17 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_FEEDBACK_FEEDBACK_SWITCHES_H_
-#define COMPONENTS_FEEDBACK_FEEDBACK_SWITCHES_H_
+#ifndef COMPONENTS_PROXIMITY_AUTH_SWITCHES_H_
+#define COMPONENTS_PROXIMITY_AUTH_SWITCHES_H_
 
+namespace proximity_auth {
 namespace switches {
 
 // All switches in alphabetical order. The switches should be documented
 // alongside the definition of their values in the .cc file.
-extern const char kFeedbackServer[];
+extern const char kEnableProximityDetection[];
 
 }  // namespace switches
+}  // namespace proximity_auth
 
-#endif  // COMPONENTS_FEEDBACK_FEEDBACK_SWITCHES_H_
+#endif  // COMPONENTS_PROXIMITY_AUTH_SWITCHES_H_