Delayed adding BluetoothEventRouter as BluetoothAdapter observer until when the

chrome/browser/extensions/api/bluetooth/bluetooth_apitest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <string.h>
 
 #include "base/stringprintf.h"
 #include "chrome/browser/extensions/api/bluetooth/bluetooth_api.h"
 #include "chrome/browser/extensions/bluetooth_event_router.h"
 #include "chrome/browser/extensions/extension_apitest.h"
@@ skipping 352 matching lines @@
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
   CloseShellWindowsAndWaitForAppToExit();
 }
 
 IN_PROC_BROWSER_TEST_F(BluetoothApiTest, Events) {
   ResultCatcher catcher;
   catcher.RestrictToProfile(browser()->profile());
 
   // Load and wait for setup
   ExtensionTestMessageListener listener("ready", true);
+  EXPECT_CALL(*mock_adapter_, AddObserver(testing::_))
+      .WillOnce(testing::Return());
   ASSERT_TRUE(LoadExtension(test_data_dir_.AppendASCII("bluetooth/events")));
   EXPECT_TRUE(listener.WaitUntilSatisfied());
 
   event_router()->AdapterPoweredChanged(mock_adapter_, true);
   event_router()->AdapterPoweredChanged(mock_adapter_, false);
   event_router()->AdapterPresentChanged(mock_adapter_, true);
   event_router()->AdapterPresentChanged(mock_adapter_, false);
   event_router()->AdapterDiscoveringChanged(mock_adapter_, true);
   event_router()->AdapterDiscoveringChanged(mock_adapter_, false);
 
@@ skipping 76 matching lines @@
   ExtensionTestMessageListener listener("ready", true);
   ASSERT_TRUE(LoadExtension(
         test_data_dir_.AppendASCII("bluetooth/get_devices_error")));
   EXPECT_TRUE(listener.WaitUntilSatisfied());
 
   listener.Reply("go");
 
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
   CloseShellWindowsAndWaitForAppToExit();
 }