Terminate call if call view presentation is delayed.

// FREEBIE

Signal/src/call/CallService.swift

@@ -1610,7 +1610,7 @@ protocol CallServiceObserver: class {
         }
 
         guard nil != UIApplication.shared.frontmostViewController as? CallViewController else {
-            OWSProdError("call_service_call_view_could_not_present", file:#file, function:#function, line:#line)
+            OWSProdError(OWSAnalyticsEvents.callServiceCallViewCouldNotPresent(), file:#file, function:#function, line:#line)
             owsFail("\(TAG) in \(#function) CallViewController should already be visible.")
             self.terminateCall()
             return

SignalServiceKit/src/Util/OWSAnalyticsEvents.h

@@ -36,6 +36,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 + (NSString *)callServiceCallUnexpectedlyIdle;
 
++ (NSString *)callServiceCallViewCouldNotPresent;
+
 + (NSString *)callServiceCouldNotCreatePeerConnectionClientPromise;
 
 + (NSString *)callServiceCouldNotCreateReadyToSendIceUpdatesPromise;

SignalServiceKit/src/Util/OWSAnalyticsEvents.m

@@ -72,6 +72,11 @@ NS_ASSUME_NONNULL_BEGIN
     return @"call_service_call_unexpectedly_idle";
 }
 
++ (NSString *)callServiceCallViewCouldNotPresent
+{
+    return @"call_service_call_view_could_not_present";
+}
+
 + (NSString *)callServiceCouldNotCreatePeerConnectionClientPromise
 {
     return @"call_service_could_not_create_peer_connection_client_promise";