[Mojo Video Capture] Use actual factory instances implementing media::VideoCaptureDeviceFactory

services/video_capture/mock_device_factory.cc

+// Copyright 2016 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 "services/video_capture/mock_device_factory.h"
+
+#include <sstream>
+
+#include "base/logging.h"
+#include "base/strings/stringprintf.h"
+#include "media/capture/video/fake_video_capture_device.h"
+#include "services/video_capture/device_mock_to_media_adapter.h"
+
+namespace video_capture {
+
+MockDeviceFactory::MockDeviceFactory() = default;
+
+MockDeviceFactory::~MockDeviceFactory() = default;
+
+void MockDeviceFactory::AddMockDevice(
+    mojom::MockVideoCaptureDevicePtr device,
+    const media::VideoCaptureDeviceDescriptor& descriptor) {
+  devices_[descriptor] = std::move(device);
+}
+
+std::unique_ptr<media::VideoCaptureDevice> MockDeviceFactory::CreateDevice(
+    const media::VideoCaptureDeviceDescriptor& device_descriptor) {
+  mojom::MockVideoCaptureDevicePtr* device = &(devices_[device_descriptor]);
+  if (device == nullptr) {
+    return nullptr;
+  }
+  return base::MakeUnique<DeviceMockToMediaAdapter>(device);
+}
+
+void MockDeviceFactory::GetDeviceDescriptors(
+    media::VideoCaptureDeviceDescriptors* device_descriptors) {
+  for (const auto& entry : devices_)
+    device_descriptors->push_back(entry.first);
+}
+
+void MockDeviceFactory::GetSupportedFormats(
+    const media::VideoCaptureDeviceDescriptor& device_descriptor,
+    media::VideoCaptureFormats* supported_formats) {
+  NOTIMPLEMENTED();
+}
+
+}  // namespace video_capture