[invalidation] Componentize TiclProfileSettingsProvider

components/invalidation/impl/invalidation_prefs.cc

Index: components/invalidation/impl/invalidation_prefs.cc
diff --git a/components/invalidation/impl/invalidation_prefs.cc b/components/invalidation/impl/invalidation_prefs.cc
index 09bfab67abbc90b6c1cb234a55c0545232e0d12e..ff692cb7e660c39ec773ca10fb0abad4ac563326 100644
--- a/components/invalidation/impl/invalidation_prefs.cc
+++ b/components/invalidation/impl/invalidation_prefs.cc
@@ -18,5 +18,10 @@ const char kInvalidatorInvalidationState[] = "invalidator.invalidation_state";
 // yet.  Used to keep invalidation clients in sync in case of a restart.
 const char kInvalidatorSavedInvalidations[] = "invalidator.saved_invalidations";
 
+// Boolean indicating that TiclInvalidationService should use GCM channel.
+// False or lack of settings means XMPPPushClient channel.
+const char kInvalidationServiceUseGCMChannel[] =
+    "invalidation_service.use_gcm_channel";
+
 }  // namespace prefs
 }  // namespace invalidation