Improve Profiles Debug UI.

Signal/src/ViewControllers/DebugUI/DebugUIProfile.swift

@@ -35,6 +35,11 @@ class DebugUIProfile: DebugUIPage {
             OWSTableItem(title: "Log User Profiles") {
                 profileManager.logUserProfiles()
             },
+            OWSTableItem(title: "Log Profile Key") {
+                let localProfileKey = profileManager.localProfileKey()
+                Logger.info("localProfileKey: \(localProfileKey.keyData.hexadecimalString)")
+                profileManager.logUserProfiles()
+            },
             OWSTableItem(title: "Regenerate Profile/ProfileKey") {
                 profileManager.regenerateLocalProfile()
             },

SignalMessaging/profiles/OWSProfileManager.m

@@ -851,6 +851,7 @@ typedef void (^ProfileManagerFailureBlock)(NSError *error);
 {
     OWSUserProfile *userProfile = self.localUserProfile;
     [userProfile clearWithProfileKey:[OWSAES256Key generateRandomKey] dbConnection:self.dbConnection completion:nil];
+    [self.tsAccountManager updateAccountAttributes];
 }
 
 - (void)addUserToProfileWhitelist:(NSString *)recipientId

SignalServiceKit/src/Network/WebSockets/OWSWebSocket.m

@@ -741,6 +741,17 @@ NSString *const kNSNotification_OWSWebSocketStateDidChange = @"kNSNotification_O
     }
 }
 
+- (dispatch_queue_t)serialQueue
+{
+    static dispatch_queue_t _serialQueue;
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        _serialQueue = dispatch_queue_create("org.signal.websocket", DISPATCH_QUEUE_SERIAL);
+    });
+    
+    return _serialQueue;
+}
+
 - (void)processWebSocketRequestMessage:(WebSocketProtoWebSocketRequestMessage *)message
 {
     OWSAssertIsOnMainThread();
@@ -756,7 +767,7 @@ NSString *const kNSNotification_OWSWebSocketStateDidChange = @"kNSNotification_O
         __block OWSBackgroundTask *_Nullable backgroundTask =
             [OWSBackgroundTask backgroundTaskWithLabelStr:__PRETTY_FUNCTION__];
 
-        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+        dispatch_async(self.serialQueue, ^{
             BOOL success = NO;
             @try {
                 NSData *_Nullable decryptedPayload =