Make migrations more robust

Occasionally these will fail if they happen to be executed before the
necessary dependencies (storage, ConversationCollection) are declared.

// FREEBIE

js/background.js

@@ -68,6 +68,7 @@
 
     storage.fetch();
     storage.onready(function() {
+        window.dispatchEvent(new Event('storage_ready'));
         setUnreadCount(storage.get("unreadCount", 0));
 
         if (textsecure.registration.isDone()) {

js/database.js

@@ -14,6 +14,7 @@
             version: "1.0",
             migrate: function(transaction, next) {
                 console.log('migration 1.0');
+                console.log('creating object stores');
                 var messages = transaction.db.createObjectStore("messages");
                 messages.createIndex("conversation", ["conversationId", "received_at"], { unique: false });
                 messages.createIndex("receipt", "sent_at", { unique: false });
@@ -42,6 +43,8 @@
                 var conversations = transaction.objectStore("conversations");
                 conversations.createIndex("search", "tokens", { unique: false, multiEntry: true });
 
+                window.addEventListener('storage_ready', function() {
+                    console.log('migrating search tokens');
                     var all = new Whisper.ConversationCollection();
                     all.fetch().then(function() {
                         all.each(function(model) {
@@ -49,6 +52,7 @@
                             model.save();
                         });
                     });
+                });
                 next();
             }
         },
@@ -58,6 +62,8 @@
                 console.log('migration 3.0');
                 var conversations = transaction.objectStore("items");
 
+                window.addEventListener('storage_ready', function() {
+                    console.log('migrating unread count');
                     var all = new Whisper.ConversationCollection();
                     all.fetch().then(function() {
                         var unreadCount = all.reduce(function(total, model) {
@@ -70,6 +76,7 @@
                         storage.remove('unreadCount');
                         storage.put('unreadCount', unreadCount);
                     });
+                });
                 next();
             }
         },
@@ -77,6 +84,8 @@
             version: "4.0",
             migrate: function(transaction, next) {
                 console.log('migration 4.0');
+                window.addEventListener('storage_ready', function() {
+                    console.log('migrating search tokens');
                     var all = new Whisper.ConversationCollection();
                     all.fetch().then(function() {
                         all.each(function(c) {
@@ -84,6 +93,7 @@
                             c.save();
                         });
                     });
+                });
                 next();
             }
         },
@@ -91,9 +101,12 @@
             version: "5.0",
             migrate: function(transaction, next) {
                 console.log('migration 5.0');
+                window.addEventListener('storage_ready', function() {
+                    console.log('migrating registration flags');
                     if (storage.get("chromiumRegistrationDone") === "") {
                         storage.put("chromiumRegistrationDoneEver", "");
                     }
+                });
                 next();
             }
         },
@@ -101,12 +114,15 @@
             version: "6.0",
             migrate: function(transaction, next) {
                 console.log('migration 6.0');
+                window.addEventListener('storage_ready', function() {
+                    console.log('migrating registration flags');
                     storage.onready(function() {
                         if (storage.get("chromiumRegistrationDone") === "") {
                             storage.put("chromiumRegistrationDoneEver", "");
                             next();
                         }
                     });
+                });
                 next();
             }
         },
@@ -114,6 +130,7 @@
             version: "7.0",
             migrate: function(transaction, next) {
                 console.log('migration 7.0');
+                console.log('creating debug log');
                 transaction.db.createObjectStore("debug");
                 next();
             }