[IndexedDB] Add Observer Tests

third_party/WebKit/LayoutTests/storage/indexeddb/resources/observer-init.js

+var initObserverTestState = function(t, callback) {
+
+  var pendingRequests = 2;
+  var openDone = function() {
+    pendingRequests = pendingRequests - 1;
+    if (pendingRequests == 0) {
+      callback();
+      t.done();
+    }
+    else if (pendingRequests < 0) {
+      assert_unreached("Database added without incrementing pending count.");
+    }
+  };
+
+  var deleteAndOpen = function(dbName, onUpgrade, onOpen) {
+    var deleteRequest = indexedDB.deleteDatabase(dbName);
+    deleteRequest.onerror = t.unreached_func('deleteDatabase should not fail');
+    deleteRequest.onsuccess = t.step_func(function(e) {
+      var openRequest = indexedDB.open(dbName);
+      var upgradeCalled = false;
+      openRequest.onerror = t.unreached_func('open should not fail');
+      openRequest.onupgradeneeded = t.step_func(function() {
+        upgradeCalled = true;
+        var db = openRequest.result;
+        db.onerror = t.unreached_func('db should not fail');
+        onUpgrade(db);
+      });
+      openRequest.onsuccess = t.step_func(function() {
+        assert_true(upgradeCalled);
+        var db = openRequest.result;
+        onOpen(db);
+      });
+    });
+  };
+
+  deleteAndOpen("observersDB1", function(db) {
+    var os1 = db.createObjectStore('store1');
+      var os2 = db.createObjectStore('store2');

[cmumford, 2016/10/25 17:57:30]

Nit: fix indent.

[dmurph, 2016/10/25 18:23:51]

Done.

+      os1.put('b', 'a');
+      os2.put('y', 'x');
+  }, openDone);
+
+  deleteAndOpen("observersDB2", function(db) {
+    var os1 = db.createObjectStore('store3');
+    var os2 = db.createObjectStore('store4');
+    os1.put('c', 'c');
+    os2.put('w', 'w');
+  }, openDone);
+};