Initialize AVFoundation explicitly

media/video/capture/mac/video_capture_device_factory_mac_unittest.mm

 // Copyright 2014 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 "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/thread_task_runner_handle.h"
 #import "media/base/mac/avfoundation_glue.h"
 #include "media/base/media_switches.h"
 #include "media/video/capture/mac/video_capture_device_factory_mac.h"
 #include "media/video/capture/mac/video_capture_device_mac.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 class VideoCaptureDeviceFactoryMacTest : public testing::Test {
   void SetUp() override {
+    AVFoundationGlue::InitializeAVFoundation();
     base::CommandLine::ForCurrentProcess()->AppendSwitch(
         switches::kEnableAVFoundation);
   }
 
  private:
   base::MessageLoop message_loop_;
 };
 
 TEST_F(VideoCaptureDeviceFactoryMacTest, ListDevicesAVFoundation) {
   if (!AVFoundationGlue::IsAVFoundationSupported()) {
@@ skipping 11 matching lines @@
   }
   // There should be no blacklisted devices, i.e. QTKit.
   std::string device_vid;
   for (VideoCaptureDevice::Names::const_iterator it = names.begin();
       it != names.end(); ++it) {
     EXPECT_EQ(it->capture_api_type(), VideoCaptureDevice::Name::AVFOUNDATION);
   }
 }
 
 };  // namespace media